A Unix commandline client for the Hotline protocol. Also included is a gtk+ front end. Written by rorschach and contributed to by a bunch of other frequenters of Badmoon. To be more specific though, hx uses a protocol based on the one used by version 1.2.x of Hotline, but the two have since gone their seperate ways, being improved in areas important to their respective developers. Hx adds stuff like support for HOPE encrypted login. Hx is however, backwards compatible with the earlier Hotline protocols which are still supported by Hotline Server 1.8.x. The server for hx is hxd as you would expect (the two come bundled together actually, along with a Hotline Tracker daemon), and there is a client for Mac OS called Zombie.

Url: http://www.hotlinex.org/