Below are some very helpful links which could come in handy to you.

Halo Revolution WIP Game Topic at the Game Maker Community;
http://gmc.yoyogames.com/index.php?showtopic=308676&hl=Halo+Revolution

YOYO Games - The Biggest Online Games Website for Game Maker Games;
http://www.yoyogames.com

Halo Revolution is created in Game Maker, an easy to use game making program. If you wish to create your own games, download Game Maker as well as some very helpful tutorials below;
http://www.yoyogames.com/gamemaker/

Game Maker Community - A large community of people who create games using game maker. Ask questions, request graphics or sound effects, download tutorials, get advice, download other people's games or show your game off to the community.
http://gmc.yoyogames.com/

To upload games or any files from your community to let others download and play your games, here are two of the safest and most popular upload sites;
www.host-a.net
www.box.net

ImageShack - Upload pictures to post in topics, for screenshots of your game or to show others glitches of their games.
www.imageshack.us