Miranda IM is an open source, multi-protocol instant messaging client designed to be very light on system resources, extremely fast and customizable. A powerful plugin-based architecture make Miranda IM one of the most flexible clients on the planet.
- Instant Messaging
[the "Just OK" review for support is there because N/A doesn't exist -- I haven't gone looking for support.] I found the skype plugin, which is a cool thing, but there's no XMPP, either included or as an add-on, thus the '4' for features.