Source SDK
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The Source SDK is a software development kit first released on 5 November, 2004 compiled by Valve that is used to create maps or mods for the Source Engine. Some of the SDK features are:
- A launcher similar to main menu screens seen in early Valve games.
- A drop-down menu to select the Source Engine version and base game.
- The Hammer Editor.
- Half-Life Model Viewer and face poser.
In 2003, the Half-Life 2 beta source code was leaked to the public, the leak included the source code for a early build of Team Fortress 2 and the SDK. Team Fortress 2 uses Source SDK 2007.
