Best Knowledge Management Tools software in 2026

AFFiNE Community Edition

affine.pro

Open source

Next-gen knowledge base that brings planning, sorting and creating all together. Privacy first, customizable and ready to use (alternative to Notion and Miro).

Atomic Server

atomicserver.eu

Open source

Knowledge graph database with documents (similar to Notion), tables, search, and a powerful linked data API. Lightweight, very fast and no runtime dependencies.

Digimindmap

ladigitale.dev

Open source

Create simple mindmaps (documentation in French).

LibreKB

librekb.com

Open source

Web-based knowledge base solution. A simple web app, it runs on pretty much any web server or hosting provider with PHP and MySQL.

memEx

codeberg.org

Open source

Structured personal knowledge base, inspired by zettlekasten and org-mode.

SiYuan

b3log.org

Open source

A privacy-first personal knowledge management software, written in typescript and golang.

TeamMapper

github.com

Open source

Host and create your own mindmaps. Share your mindmap sessions with your team and collaborate live on mindmaps.