How to classify this project?

How to classify this project?

http://vault.digitalmzx.net/

MegaZeux is a game creation system with its roots in 1990s DOS, which is still being actively developed today by its community. dMZX has long been regarded as the community hub for MegaZeux; inside you'll find everything from forums to an enormous archive of MegaZeux games.

Forums: 

Tools -> Game Making