Top Open Source Personal Knowledge Management (PKM) Tools in 2026
A curated collection of the 14 best free and open-source Personal Knowledge Management (PKM) tools in 2026. Compare features, GitHub stars, tech stacks, and self-hosted software.
SurfSense
Open-source NotebookLM alternative for live web research
Stars16,022Last commit13d agoLicenseOpen Source
Memos
Open-source self-hosted note-taking tool
Stars62,583Last commit11d agoLicenseMIT
OpenNotas
Open-source, lightweight note-taking app with E2E encryption
Stars178Last commit1mo agoLicenseOpen SourceNotesnook
Open source zero-knowledge private note taking app
Stars14,473Last commit10d agoLicenseGPL-3.0Khoj
Self-hostable AI assistant that connects to your docs and the web, lets you build agents, schedule automations, and run research with verifiable citations.
Stars36,733Last commit1mo agoLicenseAGPL-3.0Justnote
Justnote is a secure note-taking app that lets you easily create and sync notes across devices while maintaining full control of your data.
Stars67Last commit7mo agoLicenseGPL-2.0Joplin
Cross-platform note-taking app with end-to-end encryption, Markdown support, web clipping, and sync via Dropbox, OneDrive, or Joplin Cloud.
Stars56,125Last commit10d agoLicenseOpen SourceDeta Surf
AI-powered notebook for organizing web and file research
Stars3,542Last commit3mo agoLicenseApache-2.0Blinko
Open-source AI-powered note-taking app
Stars10,958Last commit10d agoLicenseGPL-3.0
SiYuan
Privacy-first personal knowledge management
Stars46,005Last commit19d agoLicenseAGPL-3.0AppFlowy
Self-hosted AI workspace for teams
Stars75,997Last commit2mo agoLicenseAGPL-3.0
AnyType
Privacy-first all-in-one workspace for notes and collaboration
Stars8,706Last commit11d agoLicenseOpen SourceBeaver Notes
Local-first open-source notes app with no cloud or AI
Stars1,334Last commit24d agoLicenseMIT
Logseq
Privacy-first open-source knowledge base
Stars44,652Last commit11d agoLicenseAGPL-3.0
