gPhoto is a program and library framework that lets users download pictures from their digital cameras. The libgphoto2 library gives you access to hundreds of models of digital cameras on several platforms. GIT repo and Issue tracker lives at https://github.com/gphoto/ these days.
Audio converter and CD ripper for various formats
fre:ac is a free audio converter and CD ripper for various formats and encoders. It features MP3, MP4/M4A, WMA, Ogg Vorbis, FLAC, AAC, and Bonk format support, integrates freedb/CDDB, CDText and ID3v2 tagging and is available in several languages.
Advanced music player for GNU/Linux, also running on FreeBSD, OpenBSD and Microsoft Windows. Plays audio CDs, internet radio streams, podcasts and soundfiles in just about any audio format and has the feature of inserting no gaps between adjacent tracks.
Online game and portal engine.
Open source version of the jsonb engine.