Avionics is an awfully broad topic, but it appears that Honeywell and Rockwell Collins are two major suppliers of avionics that appear in the aircraft that you list - well at least Boeing - can't speak for Airbus as I really don't know.
You can try searching in these links for some of your answers:
(click on Platforms to select the aircraft)
(click on Platform here too)
edit: Actually there's a good slideshow talking about the A380 FMS on the Honeywell site - kind of neat (new to me anyway old news to all of you guys) and different from the traditional interface with the FMS
[Edited 2005-12-17 09:25:35]
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