Newgrounds

Newgrounds is an internet institution — the creator community that helped define web animation and Flash games — and it keeps a dedicated adult section full of user-made games, animations and art. The appeal is heritage and community: a huge back catalog of free browser games and shorts, a rating and review system that surfaces the good stuff, and a genuinely creator-first culture. Because everything is user-submitted the quality ranges from brilliant to rough, and the adult content skews toward animation and simpler browser games rather than big productions. But as a free, community-driven home for adult games and animation with real history, Newgrounds still delivers.