This is a list of video games available on Steam, a digital distribution service and online gaming community operated by Valve Corporation. Steam was launched in 2003, initially with Valve's own titles. The network gained more widespread use after the release of Half-Life 2 in 2004, which was intrinsically integrated into the system. Steam has since expanded as other major publishers, including Activision, Eidos Interactive, Electronic Arts, and Ubisoft began distributing a number of their titles over the system. A substantial number of independent titles have also been released, along with several modifications for Valve's own games. A list of current and upcoming titles is also present on the service.