"Sigma File Manager" is a free, open-source, quickly evolving app
TagSpaces is an offline, open source, document manager with tagging
Self hosted FLOSS fitness/workout, nutrition and weight tracker
Open-source productivity booster with a brain
To-do manager, notepad, RSS reader...
Effortlessly track and optimize your time with Easy Time Manager.
Terminal based markdown note manager
SafeNotes - A secure and easy-to-use notes application
Plain-text file notepad with markdown support and ownCloud integration
An Academic Literature Suite
Work productivity/efficiency analytics, work-life and time manager