A couple months ago DesuraNET developers have released a Linux client for the game platform Desura, which provides services for purchasing, downloading, installing, and running a wide range of games. Now they have made the client available as open source with the goal to get bugs fixed faster and to get help with implementing new features.
Desura is basically a game distribution system, similar to Valve's Steam, but with more emphasis on supporting smaller game developers. Currently you can purchase some 65 games with Desura, or play the free ones that are provided with the installation, such as the strategy game TripleA or the first person shooter Alien Arena.
Desura's services are mostly accessed through an interface to the project web site, which is based on the Chromium Embedded Framework. The client has a "Play" tab for accessing installed games and a "Games" tab for purchasing or downloading. Other features are accessed through the "Community", "Development", and "Support" tabs.
The open source version is called "Desurium" (in analogy to "Chome" and "Chromium"?), and can be accessed at github.