--ROMS--

VIMM'S LAIR: best place for clean roms on major systems up to Wii.
https://vimm.net/?p=vault

ROMHACKING.NET: fan translations,undubs, romhacks, and homebrew with extremely useful search (requires patching orginal roms manualy)
https://www.romhacking.net/

--CUSTOM FIRMWARE/HACKING--

CFW GUIDE: site covers loading custom firmware onto DSi, 3DS, Wii, Vita, etc.
https://cfw.guide/


adding later:
- wikis for specific retro handhelds (retroid & anbernic)
- guides for retro minis (nes & snes classic)