libguestfs is a library for accessing and modifying guest disk images. Amongst the things this is good for: making batch configuration changes to guests, getting disk used/free statistics (see also: virt-df), migrating between virtualization systems (see also: virt-p2v), performing partial backups, performing partial guest clones, cloning guests and changing registry/UUID/hostname info, and much else besides....

A multimedia processing and authoring framework and a video playout server for television broadcasting.

MXE (M cross environment) is a Makefile that compiles a cross compiler and cross compiles many free libraries such as SDL and Qt. Thus, it provides a nice cross compiling environment for various target platforms.

The Portland State Aerospace Society (PSAS) designs and builds open source rockets featuring highly advanced Linux-based avionics systems.

The util-vserver project provides tools for kernels with the security context patch.

Crafty is a strong, open source, multi-processor chess program. It is authored by Robert Hyatt, co-author of world champion Cray Blitz. Download from
ftp://ftp.cis.uab.edu/pub/hyatt/

Little CMS is a small-footprint, speed-optimized color management engine.,

The Linux Tools project aims to bring a full-featured C and C++ IDE to Linux developers. We build on the source editing and debugging features of the CDT and integrate popular native development tools such as the GNU Autotools, Valgrind, OProfile, RPM, SystemTap, GCov, GProf, LTTng, etc. Some projects include LTTng trace viewers and analyzers, an RPM .spec editor, Autotools build integration, a Valgrind heap usage analysis tool, and OProfile call profiling tools....

Weston is the official reference compositor implementation for Wayland. Weston can run as an X client or under Linux KMS and ships with several demo clients. The Weston compositor is a minimal and fast compositor and is suitable for many embedded and mobile use cases....

gLabels is a program for creating labels and business cards for the GNOME desktop environment. It is designed to work with various laser/ink-jet peel-off label and business card sheets that you'll find at most office supply stores.