The demoscene is one of oldest and most respected subcultures in software development. Demoscene events (AKA Demoparties) showcase some of greatest works in real-time computer graphics.

I mean, there's a Demoscene "team" leftover from days of Twitch yore. Frankly though I think there should be a category too. Demo showcases would utilize this, but it's useful to the entire pipeline. Just as you develop a game, you can make a demo production (not to be confused with game demos).