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You can also look up Unitale, which is sort of a fan-made program where people create their own boss fights. There's a ton of those.
As for complete fangames and not just boss battles...there aren't any yet to my knowledge, though I am aware of a few in development making good progress.
http://gamejolt.com/games/undertale-the-second-chance/120069
And I saw another one called "Finaltale" but there's barely any info on it at this point.
https://www.reddit.com/r/Undertale/comments/3unbvz/fangame_spoilers_gaster_fight/
OH MY GOSH YES
Download in description