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The Orange Box engine branch was released in 2007 with the Orange Box (Episode Two, Portal, Team Fortress 2). It existed side-by-side with the until 2011, when it was obsoleted by the release of Portal 2.
There are actually three Orange Box branches, referred to in the SDK Launcher as Source '2007', '2009' and 'MP'. The 2009 and MP branches do not have a different feature set, but are incompatible with 2007 due to various under-the-bonnet changes (which include a different SteamID scheme and Mac OS X compatibility).
- Source SDK Base 2007 (formerly Source SDK Base - Orange Box)
Gamecode for the 2007 branch is included in the SDK.