Deus Ex SDK

The Deus Ex SDK is a map editor and development tool for Deus Ex. It enables the editing and creation of maps for Deus Ex and other development functionalities such as browsing the UnrealScript files of the game. "SDK" is an acronym for "software development kit." The SDK is a modified version of the Unreal Editor and was the editor that Ion Storm used to create the maps of the released game.

Background
The SDK was released for free on September 22, 2000, together with the conversation editor. According to developer interviews, Ion Storm did not originally plan to release development tools for the game, but changed their minds upon seeing the community's interest in such tools and recognizing that the release of the tool would extend the lifetime of the game by facilitating the creation of mods.

Since the release of the SDK, users have utilized the tool to create a number of third party mods. Additionally, the SDK has enabled the fanbase to research the game's internal data. For example, many passwords, logins, and, codes that cannot be found in-game can be discovered using the map editor.