T4R.
I'm handy with Python and C, and will try to absorb some C# or C++ in the near future if I can tear myself away from Bioshock replays, given that those are popular low-level options for game production.
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I know QBASIC (lol), Java, C++ (though not as much in terms of its memory management since I never had to deal with it), Python (although it's been a while), and am learning C# and objective C right now.