There's a new (to me) kind of #ttrpg game dev jam on itch.io: The PrinterJam 2026 (https://itch.io/jam/printerjam2026) Looks similar to the Appendix N jam, but instead of a "lost" novel that was ignored but mentioned by Gary Gygax, you get a band name for some "lost" 90s gig, create a flyer for it, and a RPG based on that. Larger page allowance than the App. N jam, found photocopier doc look & feel preferred. Not that many participants yet, but sounds interesting.