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Open Source Personal Knowledge Management (PKM) Tools

A curated collection of the best open source tools for organizing personal information and building knowledge graphs.

Favicon of AppFlowy

AppFlowy

AI workspace for docs, projects, and wikis you control

  • Stars

    75,732

  • Last commit

    8 days ago

  • License

    AGPL-3.0
Open source collaborative workspace combining notes, databases, and AI with full data ownership, offline support, and self-hosting options.

Open Source Alternative to:

Favicon of Notion
Notion
Favicon of Memos

Memos

Self-hosted timeline for quick notes, logs, and snippets

  • Stars

    62,359

  • Last commit

    10 hours ago

  • License

    MIT
Memos is a self-hosted, open-source note-taking app built around a private timeline. Write in Markdown, skip the folder setup, and keep your data on your own server.

Open Source Alternative to:

Favicon of Notion
Notion
Favicon of Joplin

Joplin

Encrypted note-taking that syncs across all your devices

  • Stars

    56,009

  • Last commit

    9 hours ago

  • License

    Unknown
Cross-platform note-taking app with end-to-end encryption, Markdown support, web clipping, and sync via Dropbox, OneDrive, or Joplin Cloud.

Open Source Alternative to:

Favicon of Obsidian
Obsidian
Favicon of SiYuan

SiYuan

Privacy-first knowledge management with block-level linking

  • Stars

    45,890

  • Last commit

    7 hours ago

  • License

    AGPL-3.0
Personal knowledge management system with WYSIWYG block editing, bidirectional links, spaced repetition flashcards, a relational database, and end-to-end encrypted sync.

Open Source Alternative to:

Favicon of Notion
Notion
Favicon of Logseq

Logseq

Privacy-first knowledge base that connects your notes

  • Stars

    44,512

  • Last commit

    16 hours ago

  • License

    AGPL-3.0
Local-first, open-source knowledge management tool with bidirectional linking, outlines, flashcards, PDF annotations, and whiteboards for building a connected second brain.

Open Source Alternative to:

Favicon of Notion
Notion
Favicon of Khoj

Khoj

AI
AI second brain for research, automation, and personal agents

  • Stars

    36,562

  • Last commit

    18 days ago

  • License

    AGPL-3.0
Self-hostable AI assistant that connects to your docs and the web, lets you build agents, schedule automations, and run research with verifiable citations.

Open Source Alternative to:

Favicon of Claude
Claude
Favicon of SurfSense

SurfSense

AI
Privacy-first knowledge base with any AI model you choose

  • Stars

    15,964

  • Last commit

    9 hours ago

  • License

    Apache-2.0
Self-hostable NotebookLM alternative that lets teams build searchable knowledge bases from diverse sources, with support for any LLM and no data limits.

Open Source Alternative to:

Favicon of Perplexity
Perplexity
Favicon of Notesnook

Notesnook

Zero-knowledge encrypted notes that sync across all devices

  • Stars

    14,440

  • Last commit

    13 hours ago

  • License

    GPL-3.0
End-to-end encrypted note-taking app with zero-knowledge architecture, cross-device sync, web clipper, and a self-hostable sync server.

Open Source Alternative to:

Favicon of Notion
Notion
Favicon of Blinko

Blinko

AI-Powered Note Taking App

  • Stars

    10,881

  • Last commit

    16 days ago

  • License

    GPL-3.0
The next generation of open-source AI-powered card notes designed to help you quickly capture and organize inspiration so that ideas never run out.

Open Source Alternative to:

Favicon of Notion
Notion
Favicon of AnyType

AnyType

Private workspace for notes, tasks, and databases

  • Stars

    8,666

  • Last commit

    1 day ago

  • License

    Unknown
A local-first, encrypted workspace for notes, tasks, databases, and chats. Your data stays on your device, syncs peer-to-peer, and never passes through a central server.

Open Source Alternative to:

Favicon of Notion
Notion
Favicon of Deta Surf

Deta Surf

Browser and notebook combined with local-first AI

  • Stars

    3,529

  • Last commit

    2 days ago

  • License

    Apache-2.0
A browser that doubles as a personal notebook, letting you research, summarize, and take notes on web pages, PDFs, and videos without switching apps.

Open Source Alternative to:

Favicon of NotebookLM
NotebookLM
Favicon of Beaver Notes

Beaver Notes

Local-first notes app with no cloud, no AI, no tracking

  • Stars

    1,331

  • Last commit

    6 hours ago

  • License

    MIT
A privacy-focused, offline-first note-taking app that stores everything on your device, with Markdown, note linking, file attachments, LaTeX math, and bring-your-own sync.

Open Source Alternative to:

Favicon of Notion
Notion
Favicon of OpenNotas

OpenNotas

Fast, secure, and free personal note-taking app

  • Stars

    178

  • Last commit

    14 days ago

  • License

    Unknown
OpenNotas is a multi-platform, end-to-end encrypted note-taking app that offers simplicity, synchronization, and offline functionality.

Open Source Alternative to:

Favicon of Obsidian
Obsidian
Favicon of Justnote

Justnote

Privacy-focused note-taking made simple and fast

  • Stars

    67

  • Last commit

    7 months ago

  • License

    GPL-2.0
Justnote is a secure note-taking app that lets you easily create and sync notes across devices while maintaining full control of your data.

Open Source Alternative to:

Favicon of Notion
Notion
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