Good news, everyone! Crytek has made their CryENGINE available via GitHub. This step will certainly bring more improvements to the popular
The complete source tree is available via CRYTEK-CRYENGINE/CRYENGINEon GitHub. You can also check out build instructions here. Note that CryENGINE isn’t a free software project, so make sure to read licensing terms.
Open-source development community can make CryENGINE even better, so we’ll be looking forward to learning how this step turns out. You can find more details in the documentation for the engine.
Source: GitHub