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.
Ranking
Rankings based on user star ratings.
How ranks are decided
Apps with 3+ star ratings are ranked by a score computed from the average rating and the number of ratings. With few ratings, even a high average ranks lower; as ratings grow, the score approaches the real average. Rank depends on ratings only. Ratings are anonymous: one per app per browser.
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Gathering ratings
These join the ranking at 3 ratings.
Cosense (Scrapbox)
Business & Operations
A tool for sharing and organizing knowledge by writing and linking pages. Free for personal or non-profit use; the Business plan is listed at JPY 1,100 per user per month.
Free planJapanese UI
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
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
KantanProEX（DT）
Business & Operations
個人事業主・フリーランス・小規模ビジネス向けの販売管理アプリです。顧客・受注・請求・サービス・協力会社・レポートをひとつの画面で管理でき、見積書や請求書の作成・印刷・PDF出力に対応します。Mac／Windowsのパソコンの中だけで動き、データはインターネット上に置きません。サブスクなしの買い切りで、無料でダウンロードして最初の30日は全機能を試せます。
Free planAIJapanese UI
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
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
Obsidian
Business & Operations
A note-taking app that is free for personal use, with paid add-ons for Sync and Publish.
Free plan
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
Open WebUI
AI & Generative AI
A self-hosted, extensible web platform for interacting with AI models via Ollama or OpenAI-compatible APIs, designed to run fully offline.
Free planAI
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
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
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
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
ポイピク (Poipiku)
Image, Photo & Design
A Japanese web service for posting and managing illustrations. It supports uploading up to 200 images at once and anonymous emoji reactions.
Japanese UI