"Sigma File Manager" is a free, open-source, quickly evolving app
Open source note taking and to-do app with synchronization
TagSpaces is an offline, open source, document manager with tagging
Open-source productivity booster with a brain
Free and powerful note-taking application
Powerful open source team chat application
A program for saving and organizing notes
The smartest way to work on your computer
Clean and simple classroom note-taking app. By students, for students.
A Wiki for tracking notes - simple and easy!
Piggydb helps you have more fun with knowledge creation.
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An Academic Literature Suite