romhacking.net- One of the greatest, if not the greatest, ROM hacking site online today. This site has more documents than you could imagine covering almost every aspect of ROM hacking. There is also an active forum with a large number of regular members and a wide range in skills which means there are new people so you won't feel out of place and experienced people so you can get help if you're stuck!

gamehacking.org - Another very active hacking community with possibly the biggest database of codes you will find any where. These can be a really good starting point for making new hacks and the forums are full of friendly and knowledgeable people.

hacking-cult.org- Hacking Cult is full of useful information and is back online!

The Cutting Room Floor- A collection of information on left out features from games that have been discovered still lurking in the code. Lots of cool stuff like images, sounds, levels and even moves!

DarkWolf - Created the Dune and Toejam and Earl background and was kind enough to allow its usage on the site. The link leads to the rest of the Toejam and Earl map images he has created.

Gennadiy Master (NSFW) - Created the Robocop Vs Terminator background and was kind enough to allow its usage on the site. The link leads to his anime fan site which contains some images not safe for work.

InsaneSonikkuFan - Created the Sonic background, the first one used on the site, and was kind enough to allow its usage. The link takes you to his deviantArt profile where you can find some more of his creations.

Marianne - Created the Ecco background used on the site. The link leads to the original image hosted at vgmaps.com.

Tymbrimi - Created the Aladdin background used on the site. The link leads to the original image hosted at vgmaps.com.

Will Mallia - Created the Jungle Strike background and was kind enough to allow its usage on the site. The link leads to the original image hosted at vgmaps.com.

xyzbilliu - Created the Shining Force 2 background used on the site. The link leads to the original image hosted at vgmaps.com.