There are 3 main ones that I know of:
Rogue-Like: Sandbox game where you date/fuck various x-women. Light on story but has quite a few girls with a decent amount of clothing and sex options.
Doomination: Sandbox-ish visual novel where you play as Dr. Doom and corrupt a bunch of Marvel Superheroines, as close to a Marvel version of Something Unlimited as anything I've found.
The Null Hypothesis: Another X-men game, i think it was created by modders of Rogue-Like? idk, i just know there's some kind of weird history behind the development. it's pretty similar to rogue-like with a bigger focus on storyline and improving the sandbox elements, but it's early development so it doesn't have much content yet as far as i could tell. i found it pretty boring tbh.