2FAS
Security & Privacy
A local-first pair of apps: the 2FAS Auth two-factor authenticator and the 2FAS Pass password manager. Auth needs no account and supports backups.
List of open-source apps
134 apps
134 apps that APP NAVI confirmed from official sources as open-source. Last checked: 2026-11-05. Anything we could not confirm stays "Unverified"; we never guess. Prices and specs change, so check each app's official page before you use it.
actionlint
Programming & Dev Tools
A static checker for GitHub Actions workflow files, published as a linter that finds mistakes before the workflows run.
Free planIndie
Actual Budget
Daily Life & Utilities
A local-first, privacy-focused personal finance app built around envelope budgeting, with an optional self-hosted sync server.
Aegis Authenticator
Security & Privacy
A free, open-source Android app for managing 2-step verification tokens. Tokens are kept in an encrypted vault with optional biometric unlock, per the official site.
AIAvatarKit
AI & Generative AI
A Python toolkit for quickly building conversational AI avatars, published by the same GitHub account (uezo) as ChatdollKit.
Free planAIIndie
AivisSpeech
AI & Generative AI
Free speech synthesis software that produces emotionally expressive voices, usable for video narration, voice dramas and similar.
Free planAIJapanese UI
Akaunting
Business & Operations
Free, open-source online accounting software for small businesses and freelancers; send invoices and track expenses.
AntennaPod
Mobile Apps
An open-source podcast manager for Android. It subscribes to any RSS feed, downloads episodes for offline listening and has no ads in the app.
Indie
AnythingLLM
AI & Generative AI
A free, private AI assistant that runs on your own device, with no accounts, API keys or token limits required according to the official site.
AI
Ardour
Video, Audio & Music
An open-source digital audio workstation for recording, editing, mixing and mastering audio and MIDI.
AtCoder Problems
Web Services & Online Tools
A web app that helps AtCoder users solve problems and manage their progress, under the tagline 'Extend your AtCoder'.
Free planJapanese UIIndie
Atuin
Programming & Dev Tools
A tool to sync, search and back up shell history with end-to-end encryption, available for macOS, Linux and Windows.
AI
Authelia
Security & Privacy
An open-source authentication and authorization server providing multi-factor authentication and single sign-on. It also works as an OpenID Connect 1.0 provider alongside reverse proxies.
AutoHotkey
Daily Life & Utilities
A free keyboard macro program with hotkeys for keyboard, mouse and joystick, and abbreviation expansion as you type.
Biome
Programming & Dev Tools
A toolchain for web projects offering a formatter and linter, usable via CLI and LSP.
Japanese UI
Bruno
Programming & Dev Tools
A Git-native API client for REST, GraphQL, gRPC and WebSocket that works locally with no cloud syncing according to the official site.
Cal.diy
Business & Operations
A community-driven, MIT-licensed, self-hosted scheduling tool forked from Cal.com with enterprise features removed. No managed version exists; personal, non-production use is recommended.
Cataclysm: Dark Days Ahead
Games & Entertainment
A turn-based survival RPG set in a post-apocalyptic world, presented on its official site as an open-source development project.
ChatdollKit
AI & Generative AI
A Unity SDK for turning a 3D model into a voice-enabled chatbot. It supports several LLMs such as ChatGPT, Claude and Gemini and speech synthesis such as VOICEVOX and AivisSpeech.
Free planAIJapanese UIIndie
ComfyUI
AI & Generative AI
A node/graph-based tool for building visual AI workflows such as diffusion image generation, available as a desktop app and cloud service.
Free planAI
Coolify
Programming & Dev Tools
A self-hostable PaaS for deploying apps, databases and 360+ services to your own server, positioned as an open-source alternative to Heroku.
Free plan
CotEditor
Programming & Dev Tools
A lightweight plain-text editor for macOS with syntax highlighting and regex search, plus CJK-friendly features such as vertical text and encoding detection. It is free on the Mac App Store.
Free planJapanese UIIndie
CrowdSec
Security & Privacy
A security service providing IP reputation and threat feeds built from real production servers, together with its open-source Security Engine.
Cryptomator
Security & Privacy
Free open-source software that encrypts files on your device before they go to cloud storage. The site lists Cryptomator for individuals and Cryptomator Hub for teams.
Free plan
CryptPad
Web Services & Online Tools
An end-to-end encrypted, open-source collaborative office suite with documents, spreadsheets, forms and kanban boards. It can be self-hosted.
Free plan
darktable
Image, Photo & Design
An open-source photography workflow application and raw developer, as described on its official site.
Delta Chat
Social & Communication
A decentralized and secure messenger with multi-profile and multi-device support, plus interactive web apps inside chats for gaming and collaboration.
Drawpile
Image, Photo & Design
A free and open-source collaborative drawing program that lets several people draw, sketch, paint and animate on the same canvas at once.
Ente Auth
Security & Privacy
A free, open-source two-factor authentication app with end-to-end encrypted backups and sync across devices. It can also be used offline without an account.
Etherpad
Web Services & Online Tools
A real-time collaborative editor you host yourself. It shows authorship by colour, lets you replay history, and can be extended with plugins.
Excalidraw
Image, Photo & Design
An open-source virtual whiteboard for sketching hand-drawn-style diagrams and wireframes in the browser, with real-time collaboration, end-to-end encryption, and PNG/SVG export.
Free plan
Exercism
Education & Learning
A free platform for learning and practicing programming, with exercises, mentoring and a CLI. It is run by a UK-registered not-for-profit.
Free plan
Firefly III
Daily Life & Utilities
A free, open-source personal finance manager that you run on your own server.
Flarum
Social & Communication
Free, open-source forum software built by its community. The official site describes it as extensible and fast.
GCompris
Education & Learning
An educational software suite for children aged 2 to 10 with more than 100 activities covering reading, arithmetic, science and geography. It is developed by the KDE community.
Free plan
Gitea
Programming & Dev Tools
A painless self-hosted all-in-one software development service including Git hosting, code review, package registry and CI/CD.
Free plan
Graphite
Image, Photo & Design
A free, open-source 2D graphics tool (alpha) that combines vector editing and node-based generative design, running as a web app.
Grocy
Daily Life & Utilities
A household management tool that bills itself as "ERP beyond your fridge", an open-source project you host yourself.
GROWI
Business & Operations
An open-source Markdown wiki for team knowledge sharing, with real-time co-editing, permissions and an AI agent.
AIJapanese UI
HandBrake
Video, Audio & Music
An open-source, GPL-licensed, multiplatform, multithreaded video transcoder.
Hayabusa(隼)
Security & Privacy
A Rust tool that builds fast forensic timelines and performs threat hunting on Windows event logs using Sigma rules, developed by Yamato Security.
Japanese UI
Healthchecks.io
Web Services & Online Tools
A monitoring service for cron jobs and other scheduled tasks. It alerts you when a job's ping arrives late or not at all, and the official site says 20 jobs can be monitored for free.
Free plan
hledger
Daily Life & Utilities
Plain-text accounting software, described on its official site as "plain text accounting, made easy".
Indie
Hono
Programming & Dev Tools
A small, simple and ultrafast web framework built on Web Standards that runs on Cloudflare Workers, Deno, Bun, Node.js and more.
Hoppscotch
Programming & Dev Tools
An open-source API development ecosystem available on web, desktop and CLI, with offline, on-prem and cloud options.
Ice Cubes
Mobile Apps
An open-source Mastodon client written in SwiftUI, published from developer Dimillian's personal GitHub account.
Indie
ImageGlass
Image, Photo & Design
A fast, modern image viewer supporting more than 90 formats, available for Windows, macOS and Linux per its official site.
Indie
Immich
Image, Photo & Design
A self-hosted photo and video management solution with a mobile app and web interface. It supports backup, albums, sharing and ML-based search.
Free planAI
Jan
AI & Generative AI
An open-source ChatGPT alternative that runs AI models locally on your computer, and can also connect to cloud models such as GPT and Claude.
AI
Joplin
Daily Life & Utilities
A privacy-focused open-source note-taking app with sync across devices and end-to-end encryption.
Jotoba
Education & Learning
A multilingual Japanese dictionary built on free resources. It covers words, kanji, names and radicals and exposes a public API.
Kanboard
Business & Operations
A free and open-source Kanban project management software.
Karakeep
Daily Life & Utilities
An open-source bookmark manager for links, notes and images, with AI auto-tagging and self-hosting; apps for iOS, Android, Chrome and Firefox.
AI
Kdenlive
Video, Audio & Music
A free, open-source video editor from the KDE community, developed by a small, mostly volunteer team.
KeePassXC
Security & Privacy
An open-source cross-platform password manager that stores encrypted passwords locally and auto-fills them. The site says it has no cloud, ads or trackers.
Kimai
Business & Operations
An open-source time tracker for project-driven teams, with reports and invoicing.
Kiwix
Education & Learning
A nonprofit project that makes free knowledge available offline. It began with offline Wikipedia and now offers a reader app, hotspot and server tools.
Kolibri
Education & Learning
An offline-first learning platform for delivering educational content without internet access. It is developed by the nonprofit Learning Equality.
Free plan
Krita
Image, Photo & Design
A free, open-source professional painting program made by artists and largely volunteer contributors, licensed under the GNU GPL.
lazygit
Programming & Dev Tools
A simple terminal UI for git commands.
Leantime
Business & Operations
Free, open-source project management software that says it is designed for ADHD, ADD and all brains.
Leasy
Mobile Apps
A simple flashcard-style memorization app where you add your own words or phrases. It offers multiple-choice and typed questions, review of missed items and a random test, with data kept on the device.
Free planJapanese UI
Lemmy
Social & Communication
A decentralised discussion platform for communities, as described in its GitHub repository.
linkding
Web Services & Online Tools
A minimal, fast, self-hosted bookmark manager that is easy to run with Docker. It offers tags, archiving, a REST API and browser extensions.
listmonk
Web Services & Online Tools
A self-hosted newsletter and mailing list manager that runs as a single binary with Postgres. It offers subscriber segmentation, campaign analytics and a transactional mail API.
LMMS
Video, Audio & Music
A free, open-source music production tool for making melodies and beats, developed by a community.
Luanti
Games & Entertainment
Formerly Minetest: an open-source voxel game creation platform with a Lua API for making games and mods.
Marp
Programming & Dev Tools
A family of tools for creating slide decks written in Markdown, including an extension for VS Code.
Mastodon
Social & Communication
A free and open-source decentralized social media platform, described on its official site as radically different.
Free plan
Matrix
Social & Communication
An open protocol for secure decentralised communications, as its official site describes it, with open-source server implementations.
Mealie
Daily Life & Utilities
A self-hosted recipe manager and meal planner that can import recipes from URLs and build shopping lists.
Indie
Memos
Daily Life & Utilities
A free open-source self-hosted note-taking app. It keeps everyday notes in a personal timeline with Markdown and tags.
Free plan
Mermaid Live Editor
Web Services & Online Tools
An online editor that previews Mermaid flowcharts, sequence diagrams and more in real time, with SVG export and shareable links.
Mihon
Mobile Apps
An Android reader for manga, webtoons and comics. Sources are added through extensions, and reading progress can be tracked with MyAnimeList, AniList and others.
Mindustry
Games & Entertainment
A sandbox tower-defense game where you build factories to process materials and defend your base against enemy waves, with multiplayer servers.
Free planJapanese UI
Misskey
Social & Communication
Free open-source software for building social networking services, with ActivityPub support for Fediverse federation. It has a responsive web UI and PWA support.
Free planAIJapanese UIIndie
Mixxx
Video, Audio & Music
Free open-source DJ mixing software developed by an international community of DJs, programmers and artists.
Monkeytype
Education & Learning
A minimalistic, customizable typing test website with many test modes and an account system that stores speed and accuracy history.
Mumble
Social & Communication
A free, open-source, low-latency, high-quality voice chat application.
NewPipe
Mobile Apps
A free open-source YouTube client for Android designed to avoid ads and unnecessary permissions, with downloads, background play and a popup player.
Free plan
ntfy
Web Services & Online Tools
An HTTP-based pub-sub notification service that sends push notifications to phones and desktops via PUT/POST. It can be used without sign-up and is open source.
Free planIndie
OBS Studio
Video, Audio & Music
Free and open-source software for video recording and live streaming, supporting Twitch, YouTube and other providers.
Obtainium
Mobile Apps
An Android app that installs and updates apps directly from their release pages such as GitHub and F-Droid, and notifies you of new releases.
Ollama
AI & Generative AI
An open-source tool for running open AI models locally or in the cloud. It provides a CLI, a REST API and Python and JavaScript libraries.
Free planAI
OpenUtau
Video, Audio & Music
An open-source singing synthesis platform described as a UTAU successor, which can work with engines such as DiffSinger.
Organic Maps
Mobile Apps
An offline maps and navigation app built on OpenStreetMap data. The official site says it has no ads or tracking and is free.
Free planJapanese UI
Paperless-ngx
Daily Life & Utilities
A community-supported document management system for scanning, indexing and archiving documents.
Penpot
Image, Photo & Design
An open-source design platform for teams, available as a hosted app or self-hosted, with an MCP server that lets AI agents work in it.
Free planAI
Pi-hole
Security & Privacy
Network-wide ad and tracker blocking software. The official site says that once installed it covers every connected device, including phones and smart TVs.
Indie
Pinta
Image, Photo & Design
A free, open-source painting and image editing program built around simplicity, available on Linux, Mac, Windows and BSD according to its official site.
Free plan
Pixelfed
Social & Communication
A free and open-source decentralized photo-sharing social media platform. The official site credits Dansup as the creator.
Pixelorama
Image, Photo & Design
An open-source pixel art editor for sprites, tiles and animations, running on Windows, Linux, macOS and the web.
Plane
Business & Operations
A project and knowledge management platform covering work items, cycles and a wiki. It is available as a cloud service or self-hosted via Docker or Kubernetes.
AI
Plausible Analytics
Web Services & Online Tools
A privacy-friendly, lightweight alternative to Google Analytics, with no cookies or cookie banners. It offers a 30-day free trial without a credit card.
Indie
PrivateBin
Web Services & Online Tools
A minimalist open-source pastebin that encrypts in the browser so the server cannot read stored content. It supports passwords, expiry and burn-after-reading.
Pyxel
Programming & Dev Tools
A retro game engine for Python.
Readeck
Daily Life & Utilities
An app for saving interesting articles, long reads, pictures and videos to read or revisit later.
RSSHub
Web Services & Online Tools
An open-source project that generates RSS feeds for sites that lack them, with many routes and public instances. The docs state it is released under AGPL-3.0.
sd-scripts
AI & Generative AI
A collection of training, generation and utility scripts for Stable Diffusion and other image generation models, covering LoRA training and fine-tuning. Japanese versions of the README and docs are provided.
Free planAIJapanese UIIndie
Secretlint
Security & Privacy
A pluggable linter that prevents credentials from being committed. It scans a project for secrets and can run as a pre-commit hook.
Free planIndie
Shaarli
Web Services & Online Tools
A self-hosted, single-user bookmark manager and link-sharing service that stores links in a file without a database. It supports tags, RSS/ATOM feeds and plugins.
SHAREVOX
AI & Generative AI
A free text-to-speech app that uses deep-learning speech synthesis. The official site says users can adjust intonation and speed in detail and create a voice from their own recording.
Free planAIJapanese UI
Shotcut
Video, Audio & Music
A free, open-source, cross-platform video editor; Shotcut is a trademark of Meltytech, LLC.
SimpleX Chat
Social & Communication
A private messenger that uses no user identifiers, not even random ones. Connections are made via link or QR code for messages and calls, per the official site.
Sonic Pi
Education & Learning
A free open-source tool for making and performing music by writing code. The official site says it runs in the browser and also ships as apps for Windows, macOS and Linux.
Free plan
Stirling PDF
Daily Life & Utilities
A PDF tool you run on your own machine or server for editing, converting, OCR and redaction; free for individual use.
Free planAI
Stoat
Social & Communication
An open-source group chat app for friends and communities with servers, channels, voice chat and file sharing. The official site states there are no ads or data mining.
Style-Bert-VITS2
AI & Generative AI
Text-to-speech software based on Bert-VITS2 that generates emotional speech, with controllable emotion and speaking styles.
AIJapanese UI
Subway Tooter
Mobile Apps
A Mastodon client for Android phones and tablets. It features simultaneous multiple accounts, rearrangeable multi-column views and extensive filters.
Japanese UI
Surge XT
Video, Audio & Music
An open-source digital subtractive-hybrid synthesizer with two scenes per patch, available as VST3, CLAP, AU and LV2.
Suzaku(朱雀)
Security & Privacy
A Rust threat-hunting and fast forensics timeline generator for cloud logs such as AWS CloudTrail, Azure/Entra ID/M365 and Google Workspace, with native Sigma support.
Japanese UI
Takajo(鷹匠)
Security & Privacy
A fast forensics analyzer for Hayabusa results, written in Nim. It can extract indicators, build timelines and process trees, and generate HTML reports.
Japanese UI
Tandoor
Daily Life & Utilities
An open-source recipe manager, described on its official site as smart recipe management.
tbls
Programming & Dev Tools
A CI-friendly tool, written in Go, that documents a database. The repository describes it as generating documentation from schema information.
Free planIndie
Tera Term
Programming & Dev Tools
An open-source terminal emulator with an SSH module (TTSSH). Japanese manuals and language files for localizing menus are provided.
Japanese UI
Termux
Mobile Apps
A terminal emulator and Linux environment app for Android. It works without rooting or setup, and extra packages are installed with APT.
textlint
Programming & Dev Tools
A pluggable linter for natural-language text. Rules are added via npm, and it can check Markdown and plain text from the CLI with partial auto-fix.
Free planIndie
The Odin Project
Education & Learning
A free, open-source coding curriculum that can be taken entirely online. It offers a roadmap to full-stack development with hands-on projects and is maintained by volunteers.
Free planIndie
Tusky
Mobile Apps
A lightweight Android client for Mastodon supporting photos, videos, lists and custom emojis. It is free and open source.
Free plan
Tux Paint
Education & Learning
A free drawing program for children aged 3 to 12. The official site states it has no ads, is open source under the GPL and is built by a worldwide volunteer team.
Free planJapanese UIIndie
Twenty
Business & Operations
An open-source CRM with custom objects, fields, views and no-code workflows, available self-hosted or as a managed cloud.
AI
uBlock Origin
Security & Privacy
An open-source, efficient content/ad blocker extension for Chromium and Firefox, as described in its GitHub repository.
Indie
Umami
Web Services & Online Tools
An open-source web and product analytics platform that the official site says uses no cookies and collects no personal data. It covers custom events, funnels, session replay and more.
Upscayl
Image, Photo & Design
A free, open-source AI image upscaler for Linux, macOS and Windows, according to its official site.
AI
Uptime Kuma
Programming & Dev Tools
An easy-to-use self-hosted monitoring tool. It monitors HTTP(s), TCP, ping, DNS and Docker containers and sends notifications to many services.
Free plan
Vaultwarden
Security & Privacy
An unofficial self-hostable server written in Rust that implements the Bitwarden client API. The README states it is not associated with Bitwarden, Inc.
Veloren
Games & Entertainment
An action-adventure RPG set in a vast fantasy world, with cave mining, animal taming and multiplayer. The source code is public.
VeraCrypt
Security & Privacy
Free open-source disk encryption software. The official site highlights strong security.
Vikunja
Business & Operations
An open-source, self-hostable task manager with list, kanban, Gantt and table views.
Free plan
Vivliostyle
Web Services & Online Tools
An open-source CSS typesetting project for digital and web publishing. The site is available in Japanese and English, and a CLI is provided.
Japanese UI
wallabag
Web Services & Online Tools
A free, open-source, self-hostable read-it-later app that stores articles in your own archive. It supports imports from Pocket and others, plus apps and browser extensions.
Zulip
Social & Communication
An open-source team chat application for distributed teams, described on its official site as organized team chat.
サクラエディタ (Sakura Editor)
Programming & Dev Tools
A free text editor for Windows with a Japanese-language focus. Its source code is published on GitHub.
Free planJapanese UI
なでしこ3 (Nadesiko3)
Education & Learning
An open-source programming language in which programs are written in Japanese, aimed at automation and learning to program. A web version and a PC (Go) version are available.
Free planJapanese UI