RED
RED is the Red Faction Level Editor. RED is usually assumed to mean "Red EDitor".
Levels in Red Faction are comprised of BSP brushes and meshes exported from 3D Studio Max 4.2 or 5.0.
Purpose
The purpose of RED is simply to produce levels (maps) for the PC and Ps2 game "Red Faction".
RED can also be used to test various edits when developing Mods.
Functionality
Brushes: BSP Brushes make up the bulk of a level. They define rooms and objects within those rooms. Brushes are often used in custom levels as a substitute for static meshes because RED does not support adding additional meshes without developing a seperate mod.
Textures: Textures are what you see on the polygons (faces) in a level.
History
Customization
A few years ago, RED-FROG released his own custom modified version of RED, called RED-Optimized. This version saw enlarged important buttons, removed help strings and removal of the splash screen.