Resource:GECK (program)

The official editor for Fallout 3, called the G.E.C.K. (Garden of Eden Creation Kit), that can be downloaded for free, allows PC users to create and add their own content to the game.

G.E.C.K. provides the community with tools that will allow players to expand the game. Users can create, modify, and edit any data for use with Fallout 3, from building landscapes, towns, and locations to writing dialogue, creating characters, weapons, creatures, and more.