X-Moto
X-Moto is a free and open source multiplatform 2D motocross platformer game, a 2D motorcycle trial simulator
Quod Libet
Quod Libet is a free and open source, multi-platform music player and music library manager
qTox
qTox is a free and open source instant messaging client with support for text, voice, and video chats, using the encrypted Tox protocol
Journable
Journable – free and open source simple bullet journal (digital notebook)
Rhythmbox
Rhythmbox is a free and open source software for playing and organizing a music collection
Sayonara Player
Sayonara Player is a free and open source lightweight and fast library manager and music player
Not Tetris 2
Not Tetris 2 – free and open source, multiplatform classic Tetris, but with realistic physics
Gajim
Gajim is a free and open source, multi-platform, easy-to-use, and full-featured XMPP client
Mailspring
Mailspring – free and open source, multi-platform fast desktop mail client