RCT2 Ride Exchange
- Publisher's site includes a ride exchange.
- http://www.atari.com/exchange/rct2/

RCT Grotto
- Offers a message board, real park recreations, and trainers. [Free membership required for some content]
- http://rctgrotto.coastergrotto.com

RollerCoaster Tycoon 3 Resource Centre
- Offers news, screenshots, downloads, cheats, and a discussion forum.
- http://www.rct3rc.com/

RollerCoaster Tycoon Tech Info Depot
- Offers utilities, save games, and technical information on the game's file formats for developers.
- http://www.strategyplanet.com/rctuk/tid/

TycoonPlanet
- Offers downloads, tracks, patches, a hall of fame, game secrets and cheats, reviews, and a list of how to abuse part guests. Also has a chat and forum.
- http://www.tycoonplanet.com/page.asp?page=home&home=news

The Evil One
- Offers parks, tracks, patches, and utility downloads. Also has a chatroom and a forum.
- http://theevilone.tycoonplanet.com/

RCT2MG
- Features parks, tracks, and a message board. Also has a guide to building coaster inversions.
- http://rctmasterguide.tycoonplanet.com/

RCT Inc.
- Features parks, tracks, fan-created scenarios, utilities, community park projects, interviews, and a picture gallery.
- http://rctinc.tycoonplanet.com/index.shtml