Indie game storeFree gamesFun gamesHorror games
Game developmentAssetsComics
SalesBundles
Jobs

Yeah, that's it. Wonder if the engine is still around?

No because the site is gone. Adrien decided to just upload the entire source for nintendo nightmare instead of the old cut down version. It makes more sense that way.

Apparently there is a Yoyogames Sandbox archive somewhere and you can download any game off of it, including the Nightmare Engine.