Note-Taking & Knowledge Bases

Self-organizing AI second brain for Obsidian + Claude Code. Drop any source and Claude reads, links, and files it into one connected knowledge graph of plain Markdown you own. AI note-taking, personal knowledge management (PKM), and an open-source Notion alternative. Based on Karpathy's LLM Wiki pattern.

Notes manager for macOS/iOS

Collect your thoughts and notes without leaving the command line.

📝 ‎ A web-based notes app for developers.

A free, open-source developer workspace. Snippets, notes, HTTP requests, calculations, and dev tools in one local-first app.

Infinite canvas drawing/whiteboarding app for Windows, Linux and macOS. Made with Godot.

Think fearlessly with end-to-end encrypted notes and files. For issues, visit https://standardnotes.com/forum or https://standardnotes.com/help.

Athens is no longer maintainted. Athens was an open-source, collaborative knowledge graph, backed by YC W21

QOwnNotes is a plain-text file notepad and todo-list manager with Markdown support and Nextcloud / ownCloud integration.

An open source personal productivity platform built on Markdown, turbo charged with the scripting power of Lua

A dedicated scratchpad for power users

⚡️next-generation personal AI assistant powered by LLM, RAG and agent loops, supporting computer-use, browser-use and coding agent, demo: https://demo.openagentai.org

5ire is a cross-platform desktop AI assistant, MCP client. It compatible with major service providers, supports local knowledge base and tools via model context protocol servers .

TagSpaces is an offline, open source, document manager with tagging support

🌻 The collaborative editing software that runs Wikipedia. Mirror from https://gerrit.wikimedia.org/g/mediawiki/core. See https://mediawiki.org/wiki/Developer_access for contributing.

Open-source and local-first Slack and Notion alternative that puts you in control of your data

Resources, links, projects, and ideas for gardeners tending their digital notes on the public interwebs

Browser extension to curate, annotate, and discuss the most valuable content and ideas on the web. As individuals, teams and communities.

The DokuWiki Open Source Wiki Engine

TypeDB: Built for systems, not records

Fast and beautiful note-taking app written in C++. Write down your thoughts.