I believe there is a source mod stargate game. I haven't had the chance to play it but I'll see if I can find it.
Edit: Here's one of them, there appear to be more than one though. Link
There is also Stargate: Resistance, I played it a while back but it wasn't all that great. There was an MMO by the name of Stargate: Worlds in development as well, but last I heard the studio developing it went under unfortunately.
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