Valve have released the latest small update to Team Fortress 2. Following on from the update released at the start of May, it's another that pulls in some community-provided fixes thanks to the source code being available as part of the Source SDK update.
So does that mean anyone can do what they want with the code?
Everything non-commercial
Which means it isn’t truly open source, just that the source code is available.
Don’t get me wrong, I love that the source for TF2 is available, but it’s not open source.