so,I thought to list the DX series inspirations and references.but I also ask the community to help with it.
to do it simply name a reference or inspiration you see in the franchise,but to facilitate do this
DXS:the entire series
DX
DX:IW
DX:HR
and only one post per person
let's start

DXS:the setting reminds me so much of Ghost in The Shell,both the movies and the series,but more inspired on the movie

The password to the UNATCO Comm Van is 0451. This password also appears in the other Deus Ex and System Shock games, usually as the first password used in each game, and also found its way into Bioshock and Dishonored. All of these games feature horrifying dystopian worlds, and this code hints that Ray Bradbury's dystopian sci-fi novel Fahrenheit 451 was a huge influence on this school of gaming.

DX has a number of references (playing through for the first time at the moment)

One is a reference to Return Of the Jedi, which during production was known as Blue Harvest http://en.wikipedia.org/wiki/Blue_Harvest this comes up in an email.

There was a character name in an email I saw yesterday that was also a reference. Can't remember who it was now but I'm certain it was a females name.

Robocop reference in deus ex HR:
http://www.youtube.com/watch?v=rWL0Tfaqvq0