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).
Foam is a personal knowledge management and sharing system inspired by Roam Research, built on Visual Studio Code and GitHub. You can use Foam for organising your research, keeping re-discoverable notes, writing long-form content and, optionally, publishing it to the web.
MindForger aims to mimic human mind - learning, recalling, recognizing, associations, forgetting - in order to achieve synergy with your mind to make your searching, reading and writing more productive.
Encryptic is an open-source note-taking application heavily focused on encryption. When you start writing, no one will know what you write except for you. We don’t know and we don’t want to know. That’s between you and your work.
WRITE OFFLINE You can write/edit your notes on your laptop even if you are offline. MULTIPLE DEVICES Boostnote is available for browser, desktop and mobile. SYNTAX HIGHLIGHT Boostnote can highlight code syntax in more than 100 languages.