Well..my favorite website is...

[TheGoldenGamer50]

https://www.srb2.org
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SONIC ROBO BLAST 2!
A completed (I think)Sonic fan game...It's actually one of the best Sonic fan games around

It could be better then Sonic Mania too

[Trigger215]

It's amazing what can be done in the Doom engine. Especially when you consider this was converted into a kart racer.