I need to get my hand on a list for general companies who offer chat support. Would you know how would I apraoch finding something like that?

Well, I can give you one:

humanclick.com

As for the list, try www.google.com

I'm actually not looking for a chat program, but for company or sites that use chat programs

You will find you should be able to get some software through these guys.

http://www.bravenet.com/

:) again not designers or programs but users.

We use a chat program, what do you want to know?

50% of the hosts here do too.....

*agrees with NexDog*