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I know of two: Craigslist and Plenty Of Fish.

Are they 1-person projects? Also, Minecraft was build solo by Notch, I guess.

https://en.m.wikipedia.org/wiki/Mojang_Studios helped with minecraft, even before the MS purchase.

As an employee of Mojang Studios, Jens Bergensten had been co-developing Minecraft with Persson since 2010.