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.
A very high quality package of printer drivers for CUPS on Linux, Macintosh OS X, and other POSIX-compliant operating systems. This project also maintains an enhanced Print plug-in for GIMP 2.x from the same code base.
A GTK+ Gnutella client, optimized for speed and scalability
A GTK+ Gnutella client, efficient, reliable and fast, written in C. It has been optimized for speed and scalability, with low-memory consumption. It is meant to be left running 24x7, using little CPU and only the configured bandwidth. It is possible to run gtk-gnutella without a GUI or using a shell interface.
Pioneers - The Settlers of Catan
Pioneers is an emulation of the board game The Settlers of Catan, which can be played over the internet.
NMDC Hub Server
Verlihub is a NMDC hub server that runs on all operating systems. It is written in C++ and has many rich plugins including Lua, Python and Perl.