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).
Lessy is a time manager application built upon strong principles. It is designed to be as intuitive and inclusive as possible. Its goal is to help people to recover their power to manage time, instil self-confidence and challenge their capacity to question themselves.
Dailly allows you to create, manage and track your daily goals in a simple and aesthetics way. No ADS, no trackers, and no databases. Your data is stored on your device and is only accessible by you, as it should be.