3- Free CGI-Script Chat Software
This is a web chat script designed to work under any browser,
to be as simple as possible for everyone, and it is one of the
most lightweight chat scripts out there.
DarkChat is a CGI script written in Perl. It doesn't have
multi-room capabilities, but it can still do private messages.
With FreeChat, they need not download any special software!
Their current web browser is all that is needed! Java is not
needed. A frames-capable browser is not required, but is
supported. A graphical browser is not required (so even Lynx
users can participate)