RetroBrowser+, a free Chrome extension that plays retro console games (NES, SNES, Game Boy, GBA, Sega, Neo Geo, PlayStation) in the browser, with save states, controller support, and CRT filters.
After Nintendo's 2024 takedowns of Yuzu and Ryujinx, RomM (by Zurdi, started Mar 2023) is highlighted: a self-hosted ROM manager, not an emulator. It scans your own dumped ROMs, pulls metadata/box art/achievements (IGDB, MobyGames, Screenscraper, SteamGridDB, RetroAchievements), and plays in-browser via EmulatorJS. AGPL-3.0, ~9.1k stars, 400+ platforms, apps/plugins for Playnite, Android Argosy, muOS/Anbernic, RetroArch, Steam Deck, Syncthing; library sharing with permissions.
Hot take: "Steam Machine is dead" — a used PS5 (~$400) can now run any game with similar performance; hardware has no real software lock anymore. Quotes Mihawk9_9: PS5 Proton (PP), homebrew that runs 32/64-bit Windows games on PS5 via Proton, growing into "Mihawk OS," a Windows 11 clone, with a Linux compatibility layer planned.
Teaser: Xbox 360 ⇄ PS3 ⇄ PC crossplay online on unmodded consoles, coming soon. Video demo attached; no technical details or release date given.