CRYENGINE is now free, get started with a pay-what-you-want plus charity AAA gamemaking bundle with over 20,000 files to create your own game plus the full suite of CRYENGINE game development tools. Includes 100% exclusive assets which are royalty free and may be used in commercial projects. Plus Survival, Racing, and FPS starter projects to give you a jump start on some of the most popular genres of games. There is also a Free Campfire asset pack.
https://www.cryengine.com/
Link to Official Site (Humble Bundle)
Link to Official Site (Cry Engine)