A must have to play E0. Contains the models, textures, sounds etc needed to play Marathon-type maps.
E0Edit, built for Macs and Windows.
As per the GPL, this archive contains the source code for Engine/Zero v0.21 and E0Edit (Which is an RB program).
Latest build of E0 for Mac OS.
Latest build of E0 for Windows.
A script that lets "guided" projectiles seek what you're looking at.