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Startup (2001) (also named "Antitrust")

http://www.imdb.com/title/tt0218817/

it has some C, Java and HTML code. It also explains "open source" and is a pretty good movie. Miguel de Icaza helped them, so you see GNU/Linux desktops and GNOME shell and bash.

Cheers.

I'm actually pretty sure Iron Man (2008) shows some genuine code for a second, it's when Stark is in the cave.

Bugger, I saw that only a few weeks ago. I must be blind.

http://openbiometrics.org/revolution.html

The OpenBR source code was shown in Revolution S01E18 and S01E20. Pretty neat actually that they went to the trouble to get real code for the biometrics app they were showing.