You can now make games with Penumbra Overture, the engine that it’s made with, or even get an OpenAL wrapper, all freezy-peezy. This is just now available, and I’m taking it in myself, you can get some info at the Frictional Games blog.
The most interesting bit for the moment for me;
OALWrapper
This library is made almost entirely by our tool programmer Luis, who actually started out doing work for us on the OpenAL sound implementation. This library is simple and easy way of accessing the OpenAL functionality and was made since there is a strange lack of free sound libraries. This is also the only part of the open source release that we will continue to update and we hope that others will find it useful and contribute themselves!
That could be an easy way to plug audio into Grit Game Engine, a big thank you to Frictional Games for going Open, very awesome.
source:here
