Zenity - Zenity is a tool that allows you to display GTK dialog boxes in commandline and shell scripts.
Moodle - Moodle is the world's most popular learning management system. Start creating your online learning site in minutes!
Glade - Glade is a RAD tool to enable quick & easy development of user interfaces for the GTK+ toolkit...
Collaborator - Система дистанційного навчання повного циклу із аналітикою в реальному часі та інструментами внутрішнього маркетингу.
Yad - Yad (yet another dialog) is a fork of Zenity with many improvements, such as custom buttons...
Lessonly - Getting teams up-to-speed and keeping them there.