'Alex Kidd in Mushroom World' (2022) by Bluestreak (Alex Kidd Hack)
Let's-a Go!
#NonSonicWeekend
https://www.smspower.org/Hacks/AlexKiddInMiracleWorld-SMS-AlexKiddInMushroomWorld-Mod

'Stardust The Unicorn' (2024) by Glyphcom (Original Demo)
A small platformer inspired by old-school speed games.
#NonSonicWeekend
https://sonicfangameshq.com/forums/showcase/stardust-the-unicorn.2297/

'Astropods: Starside Glaze' (2024) by CheesiMoon (Original Demo)
As a tag team of Hemi and Acro, utilize their unique combat abilities in order to restore the Waterfall of Dreams.
#NonSonicWeekend
https://sonicfangameshq.com/forums/showcase/astropods-starside-glaze-windows-0-4-2.2306/

'A Plumber For All Seasons' (2021) by WhiteYoshiEgg (Hack)
37 brand new, beautiful levels of 'Super Mario World' based on different seasons.
#NonSonicWeekend
https://www.smwcentral.net/?p=section&a=details&id=27472

'Sonic: The Robo Ranger Saga' (2000) by Ultra Sonic 007 (Canned)
https://archive.org/details/rd_20201228

'Sonic Outbound' (2020) by Project255 (Demo)
https://sonicfangameshq.com/forums/showcase/sonic-outbound-sage-2020-demo.643/

'Everyone in Rouges Outfit' (2018) by @MainMemory_ (SA2 Mod)
https://gamebanana.com/skins/165517

'Misfits Pack' (2020) by @misfits_pack (Mania Mod)
A total-conversion mod for that adds freshly-remastered classic Zones to play through, like Hill Top Zone
https://misfits-pack.carrd.co/

'Sonic GBA' (2009) by Florian Brönnimann & Steeven Flores (Demo)
A demo of a Game Boy Advance game that remakes Sonic's gameplay and music.
https://archive.org/details/sonic_GBA

'Amy Rose Pack' (2021) by Rascally Rosy (SRB2 Mod)
Adds a new take for Rosy and Modern Amy to 'SRB2'
https://mb.srb2.org/addons/amy-rose-pack-modern-amy-and-rosy.2586/