FINISHED fangames, about seven*. Fangames period, lots.

*Let's see if I can remember this... Jazz Ski Rabbit, Jazz Sky Rabbit, Jazz Adventure, that TopDown thing where you kill turtles, PacJazz, Jazz Space Invaders, Jazzball... what am I forgetting?

I repeat that most people create games alone. I have seen very few fangames that actually needed more than one person to work on them.