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 for sure C++, C#, SQL, PHP, Visual Basic(lol) and ActionScript(lol) along with BASH scrpting(does this even count?). However most languages are all very similar so I can understand stuff like Python and Java when I see it.