I you mean 3D , Frankies Funclub is very solid game which runs on Godot engine.Just out of curiosity, other than Fatal Fire's Frenni game, what are the others?
Found a good thread which seems pretty comprehensive, looks like there's about 22 games. Although many of them aren't really fappable in the way something HH is because they just use the fnaf animatronics themselves instead of hot characters lol - I can assume a future fnaf-inspired project by Ayup would have some good character designs that'd make it worth a look!
It does seem like they'll be focusing on this one first, and they've specified that they're aiming for a Steam release which one would assume will be a fully completed project. So I think any fnaf-inspired game they do will be in the future after HH's release (just going off what's been said so far, anyway!)
Of course In Heat, but that's more like a heavily-forked FNAF.
Also Cumrooms, if you like Kar or MalO.
That thread is dead and has no updates. Here's a new one.:
https://f95zone.to/threads/collection-of-fnaf-themed-games-on-f95-final-mix-2-5-hd-rebirth.219701/