The following applications are for the Linux graphical desktop environment, primarily Gnome-based.
Arduino IDE
Audacious
Lightweight media player. Claws Mail
Geany
GIMP
GNU Image Manipulation Program. An application with a comprehensive range of features for modifying images. LibreOffice
A fully-featured office package, which includes a word processor, spreadsheet, database and image drawing applications. Osmo
Calendar, diary and to do application.

Pluma
Rhythmbox
Media player with podcast feed aggregator and Internet radio client. Sylpheed
Email client. TEA Text Editor
Terminator
A multi-windowing terminal.

VLC
A multi-purpose media player.

Wireshark
Zim

Media Players