Halo Combat Evolved
CMT Full Conversion
The people at the Custom Map Team have created an awesome total conversion of Halo PC to Halo CE. They converted the entire campaign, added things such as the Halo 3-styled assault rifle, silenced weapons, new pelicans, warthogs, and a drivable wrait
This is the complete set of all 10 maps plus the UI file. This is a large file, so make sure you have the time to download this fully.