A useful list of ROM Hacking and Game Modding Resources

[CM30]

Just some I've found for each of the major games:

General

ROM Hacking.net (general)

Baddest Hacks (terrible old school style hacks)

Jul (general)

Acmlm/Board 2 (general)

Zophar's Domain (general)

Game Specific (ROM Hacking)

SMW Central (Super Mario World, Yoshi's Island, Super Mario 64)

Kale Kaverns (Kirby's Adventure)

The GCN (The Legend of Zelda Ocarina of Time and The Legend of Zelda Majora's Mask)

Pokecommunity (Pokemon series)

Kuribo 64 (Super Mario 64 DS)

Sonic Retro (Sonic the Hedgehog)

Serene's Forest (Fire Emblem)

DKC Atlas (Donkey Kong Country series)

RVLution (New Super Mario Bros Wii)

New Super Mario Bros Hacking Domain (New Super Mario Bros 1/DS)

Metroid Construction (Metroid series)

Luigi's Bigger Mansion (Luigi's Mansion)

SMSHack (Super Mario Sunshine)

Game Specific (PC Game Modding)

Nexus Mods (general)

ModDB (general)

Doomworld (Doom)

Halo Mods (Halo)

Trescom (Jurassic Park Trespasser)

Duke Repository (Duke Nukem)

Planet Minecraft, Minecraft Mods, Minecraft Forum (Minecraft)

Others

Kitty Corps Meow Mix (Super Smash Bros Brawl)

Wario Forums (if any Wario mods exist, they'll be posted here)

Hopefully that should help if anyone's looking for mods.