Skip to content

The best open-source note-taking and knowledge tools in 2026

Last updated
Sep 11, 2026
Projects considered
24
Commits reviewed
0 of 24

Note apps, personal wikis, markdown editors and knowledge bases — including the AI layers people bolt onto them.

Mostly written in Python, TypeScript, Go, HTML and JavaScript.

How this list is ranked. By total GitHub stars at the last daily refresh — a popularity signal, not a measure of quality, fit or safety. Star counts in the AI category are known to be inflated by fake-star campaigns, so each row leads with push activity and license instead. No commit in this collection has completed security review yet, so treat every entry as unreviewed discovery metadata.
  1. 1eugeniughelbur organisation mark

    obsidian-second-brain

    eugeniughelbur/obsidian-second-brain

    Persistent memory for Claude Code and 6 other CLI agents, stored as plain markdown in your Obsidian vault. Stop re-explaining your projects, decisions and people every session. 45 commands: hybrid semantic search, self-rewriting notes, key-less web research, and scheduled agents that maintain the vault while you sleep.

    Pushed 2 days ago.MIT LicensePythonPlugins5.1k+167
  2. 2inkeep organisation mark

    open-knowledge

    inkeep/open-knowledge

    Beautiful, AI-native markdown IDE and LLM wiki

    Pushed yesterday.GNU General Public License v3.0TypeScriptApps4.8k+63
  3. 3chatchat-space organisation mark

    Langchain-Chatchat

    chatchat-space/Langchain-ChatchatSlowing

    Langchain-Chatchat(原Langchain-ChatGLM)基于 Langchain 与 ChatGLM, Qwen 与 Llama 等语言模型的 RAG 与 Agent 应用 | Langchain-Chatchat (formerly langchain-ChatGLM), local knowledge based LLM (like ChatGLM, Qwen and Llama) RAG and Agent app with langchain

    Last push 12 months ago.Apache License 2.0PythonApps38.7k+4
  4. 4khoj-ai organisation mark

    khoj

    khoj-ai/khojSlowing

    Your AI second brain. Self-hostable. Get answers from the web or your docs. Build custom agents, schedule automations, do deep research. Turn any online or local LLM into your personal, autonomous AI (gpt, claude, gemini, llama, qwen, mistral). Get started - free.

    Last push 3 months ago.GNU Affero General Public License v3.0PythonAgents38.0k+124
  5. 5AgriciDaniel organisation mark

    claude-obsidian

    AgriciDaniel/claude-obsidian

    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.

    Pushed 9 days ago.MIT LicensePythonPlugins16.1k+240
  6. 6SamurAIGPT organisation mark

    llm-wiki-agent

    SamurAIGPT/llm-wiki-agent

    A personal knowledge base that builds and maintains itself. Drop in sources — Claude (or Codex/Gemini) reads them, extracts knowledge, and maintains a persistent interlinked wiki. Works with Claude Code, Codex, OpenCode, Gemini CLI. No API key needed.

    Pushed 2 days ago.MIT LicensePythonDeveloper tools3.7k+14
  7. 7firecrawl organisation mark

    firecrawl

    firecrawl/firecrawl

    The context API to search, scrape, and interact with the web at scale. 🔥

    Pushed yesterday.GNU Affero General Public License v3.0TypeScriptDeveloper tools198.2k+2.3k
  8. 8Egonex-AI organisation mark

    Understand-Anything

    Egonex-AI/Understand-Anything

    Graphs that teach > graphs that impress. Turn any code into an interactive knowledge graph you can explore, search, and ask questions about. Works with Claude Code, Codex, Cursor, Copilot, Gemini CLI, and more.

    Pushed 9 days ago.MIT LicenseTypeScriptDeveloper tools90.2k+1.7k
  9. 9lobehub organisation mark

    lobehub

    lobehub/lobehub

    🤯 LobeHub is your Chief Agent Operator, organizing your agents into 7×24 operations by hiring, scheduling, and reporting on your entire AI team.

    Pushed today.OtherTypeScriptAgents83.8k+252
  10. 10docling-project organisation mark

    docling

    docling-project/docling

    Get your documents ready for gen AI

    Pushed today.MIT LicensePythonApps70.1k+393
  11. 11siyuan-note organisation mark

    siyuan

    siyuan-note/siyuan

    An open-source, privacy-first, self-hosted knowledge workspace where humans and AI agents work together 开源、隐私优先、自托管的知识工作空间,让人与智能体在此协作

    Pushed today.GNU Affero General Public License v3.0TypeScriptApps47.1k+89
  12. 12PDFMathTranslate organisation mark

    PDFMathTranslate

    PDFMathTranslate/PDFMathTranslate

    [EMNLP 2025 Demo] PDF scientific paper translation with preserved formats - 基于 AI 完整保留排版的 PDF 文档全文双语翻译,支持 Google/DeepL/Ollama/OpenAI 等服务,提供 CLI/GUI/MCP/Docker/Zotero

    Pushed today.GNU Affero General Public License v3.0PythonApps38.2k+229
  13. 13virgiliojr94 organisation mark

    book-to-skill

    virgiliojr94/book-to-skill

    Turn any technical book PDF into a Claude Code skill — ready to study, reference, and use while you work.

    Pushed 7 days ago.MIT LicensePythonSkills36.8k+594
  14. 14Tencent organisation mark

    WeKnora

    Tencent/WeKnora

    Open-source LLM knowledge platform: turn raw documents into a queryable RAG, an autonomous reasoning agent, and a self-maintaining Wiki.

    Pushed yesterday.OtherGoPlugins36.4k+740
  15. 15ScrapeGraphAI organisation mark

    Scrapegraph-ai

    ScrapeGraphAI/Scrapegraph-ai

    Python scraper based on AI

    Pushed 29 days ago.MIT LicensePythonDeveloper tools32.5k+192
  16. 16YishenTu organisation mark

    claudian

    YishenTu/claudian

    An Obsidian plugin that embeds Claude Code/Codex as an AI collaborator in your vault

    Pushed yesterday.MIT LicenseTypeScriptPlugins15.9k+78
  17. 17nexu-io organisation mark

    html-anything

    nexu-io/html-anything

    ✨ The agentic HTML editor — your local AI agent writes the HTML, you ship it. 🚀 75 Skills × 9 Surfaces (magazine · deck · poster · XHS / tweet · prototype · data report · Hyperframes) 🛡️ Sandboxed preview · 📤 1-click to WeChat / X / Zhihu / HTML / PNG 🔑 Zero API key — Claude Code / Cursor / Codex / Gemini / Copilot / OpenCode / Qwen / Aider.

    Pushed 22 days ago.Apache License 2.0HTMLDeveloper tools9.4k+130
  18. 18windingwind organisation mark

    zotero-better-notes

    windingwind/zotero-better-notes

    Everything about note management. All in Zotero.

    Pushed 2 months ago.GNU Affero General Public License v3.0TypeScriptPlugins8.4k+26
  19. 19obgnail organisation mark

    typora_plugin

    obgnail/typora_plugin

    Typora Plugin. Feature Enhancement Tool | Typora 插件,功能增强工具

    Pushed yesterday.MIT LicenseJavaScriptPlugins4.7k+19
  20. 20obsidianmd organisation mark

    obsidian-sample-plugin

    obsidianmd/obsidian-sample-pluginSlowing

    Template for Obsidian community plugins with build configuration and development best practices.

    Last push 3 months ago.BSD Zero Clause LicenseTypeScriptPlugins4.6k+20
  21. 21geekjourneyx organisation mark

    md2wechat-skill

    geekjourneyx/md2wechat-skill

    Markdown to WeChat CLI | 一键排版发布到微信公众号:支持 40+ 排版样式和专业主题 、AI 配图 、批量发布 、多账号管理

    Pushed 20 days ago.OtherGoPlugins3.8k+15
  22. 22Ar9av organisation mark

    obsidian-wiki

    Ar9av/obsidian-wiki

    Framework for AI agents to build and maintain a digital brain through Obsidian wiki

    Pushed yesterday.MIT LicensePythonDeveloper tools3.7k+47
  23. 23honkit organisation mark

    honkit

    honkit/honkit

    :book: HonKit is building beautiful books using Markdown - Fork of GitBook

    Pushed 12 days ago.Apache License 2.0TypeScriptPlugins3.5k+1
  24. 24

    llm-ui

    richardgill/llm-ui

    The React library for LLMs

    Pushed 1 months ago.MIT LicenseTypeScriptDesign systems1.8k+2