Shotcut is a free, open source, cross-platform video editor.
A high quality MP3 encoder
Powerful desktop publishing software
Weak signal ham radio communication
Hewlett-Packard's Linux imaging and printing software
Panorama photo stitcher
Ham Radio Digital Modem Application
A cross-platform GUI library
a parametric 3D CAD modeler
SUMO is a microscopic, multi-modal traffic simulation.
An Audio/MIDI multi-track sequencer
Non-linear video editor targeted for home video editing.
JACK Audio Connection Kit Qt GUI Interface
C64/Amiga emulator with PAL shader and runAhead
GemRB is a portable open-source implementation of the Infinity Engine
Cross-platform, scientific graphics plotting library
An USB programmer for PIC, dsPIC, AVR, serial memories