id partners and related, such as Raven Software, Bungie, Volition, GarageGames, Cyan Worlds, and 3D Realms, as well as Two Tribes, Pangea Software, and several of the developers who participated in the Humble Indie Bundle, have also released code and it is now accepted practice for some mainstream game developers to release legacy source code.
Companies like Raven Software, Bungie, Volition, GarageGames, Cyan Worlds, and 3D Realms, along with Two Tribes, Pangea Software, and several Humble Indie Bundle contributors, have also released their code, making it standard practice for many major game developers to do the same.