No Intro, debug menu, map selector (1.3.643.1)+ addon

Installation:
1) Navigate into ..\Steam\steamapps\common\deus ex - human revolution\ (finding these folders depend on where you have Steam installed) and make a backup of patch2.000 though you can have Steam redownload it by doing verify integrity if you want the original file back.
2) Unpack the download into the same folder, so you'll have a "new", modded patch2.000 file. If you don't need a backup, over-write the existing file.
3) Play!