[Coda]

Javascript will take you a long way these days. In addition to being available in web browsers with tons of tools available for it, it's one of the languages supported by Unity, which is a popular game engine. And given your experience with ActionScript and NWNscript, you should find it familiar.

If you like Python, Unity supports a dialect of that.

C# is a possible choice; it's the best choice for large-scale Unity work, but its portability outside of Unity on non-Windows computers is limited.

C++ is my personal favorite language, and it can interface with a LOT of stuff, but it's also more work -- it's NOT a rapid-prototyping language like Python, and it doesn't have an all-in-one solution like Unity. But on the other hand, it's also the fastest option available to you once you DO get something working, and it lets you work with things like Unreal Engine.