The best open source alternative to Notion is Standard Notes, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to Notion and loads of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Notion are CherryTree (Free, Open Source), Zim (Free, Open Source), TiddlyWiki (Free, Open Source) and Zettlr (Free, Open Source).
AbiWord is a free software word processor. The name "AbiWord" (pronounced "Abby Word") is derived from the root of the Spanish word "abierto", meaning "open". It runs on Linux, Mac OS X (PowerPC), ReactOS, BeOS (unsupported), AmigaOS 4.
Write your content in the widely used and simple Markdown format, using the built-in visual editor. Unlike other wiki software that save content in a database with a difficult to extract format, Wiki.js saves all your content directly into Markdown (.
Logseq is a platform for knowledge sharing and management. It focuses on privacy, longevity, and user control. Notice: the backend code will be open-sourced as soon as we’re sure that the backend service meets the security standards.
A Kanban-inspired app for keeping track of things that need to get done. The goal of TaskBoard is to provide a simple and clean interface to a functional and minimal application for keeping track of tasks. It's not trying to be the next Trello or LeanKit.
NixNote, formerly Nevernote, is an open source client for Evernote . It is written in Java so it will also run on Windows & OS-X, but the primary focus has been to try and get a usable environment for Linux.