The C shell was originally written at UCB to overcome limitations in the Bourne shell. Its flexibility and comfort (at that time) quickly made it the shell of choice until more advanced shells like ksh, bash, zsh or tcsh appeared. Most of the latter incorporate features original to csh.

The Eclipse Platform is an open and extensible platform for anything and yet nothing in particular. It provides a foundation for constructing and running integrated software-development tools. The Eclipse Platform allows tool builders to independently develop tools that integrate with other people's tools so seamlessly you can't tell where one tool ends and another starts.

uWSGI presents a complete stack for networked/clustered web applications, implementing message/object passing, caching, RPC and process management. It uses the uwsgi protocol for all the networking/interprocess communications.

GStreamer is a streaming media framework, based on graphs of filters which operate on media data. Applications using this library can do anything from real-time sound processing to playing videos, and just about anything else media-related. Its plugin-based architecture means that new data types or processing capabilities can be added simply by installing new plug-ins.

xdg-user-dirs is a tool to help manage "well known" user directories like the desktop folder and the music folder. It also handles localization (i.e. translation) of the filenames.