Unreal slackers has a good c++ channel. The others, I got invited to through good luck as I got to know people.

Some of the less hardcore channels still have smart, interesting, skilled, and hard working people in them btw, I met a lot of really cool people in them.

Thank you so much, this is ideal! I had already settled on Unreal due to the platform support, license model and ability to work with C++.