Chit Chat is a small client that runs on Windows 95 (and possibly 3.11) as well as all current Windows'. Chit Chat also runs on Mac OS Classic and OS X 10.x. I found this client to be very basic and limiting. Smillies dont even show up and the fonts are customizable to a point. There is of course no support for Voice Chat or VC for short. But this is a very small and lightwieght program that runs fin on older machines and other platforms.