Resource:GECK (program)

The official editor for Fallout 3 and Fallout: New Vegas, 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. The editor requires a pre-existing installation of the associated game to function, as it requires usage of several resources.

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 or Fallout: New Vegas, from building landscapes, towns, and locations to writing dialogue, creating characters, weapons, creatures, and complex scripting.

The G.E.C.K. has an interface similar to The Elder Scrolls Construction Set, which is useful to those who are familiar with it. However, the functionality of the G.E.C.K. is far expanded over that of the Construction Set, much like the functionality of the game engine. Scripting options for the G.E.C.K. can be expanded using the Fallout 3 Script Extender (or FOSE) much like OBSE for TES IV: Oblivion; however, FOSE is not compatible with versions purchased via Direct2Drive, and having Games For Windows Live active will interfere with FOSE's functionality while playing the game.

Fallout 3 version
The Fallout 3 version was made available on December 11, 2008.

Patches
The G.E.C.K. was patched to version 1.5 in May 2009. The patch is available on the official site.

Fallout: New Vegas version
The Fallout: New Vegas version is available as of October 19, 2010, concurrent with the game's U.S. release.