I'll suggest a few:

Alternate Session - In the title, an alternate to what happens in the beta session, ongoing

Sburb Done Quick - A speedrun of sburb, completed

Hoxxesbound - Based on a game (Deep Rock Galactic) basically, space dwarfs, ongoing

I'm also seconding (thirding?) Karkat Goes to a Convention and The Crow Strider AU and any work on FRAF really (especially John Ruins a Wedding its peak)