
HotPants
A hotline clone for Mac OS X
Hotpants is fully Hotline-1.2.3-compatible, with all the standard features, plus a few additions. Hotpants features flexible timestamps, logging chat to disk, and supports the public chat subject.
The private message system combines the classic message-window system with modern history and automatic response features. It can be used in either multiple-window or single-window modes.

At long last, it is possible to mute individual chatters client-side. Other advanced features including integrated support for Synapse HXD's invisibility system, automatic login, and a macro system that allows more flexibility in chat and private messages than ever before.

Hotpants uses Mac OS X's column view in the file area, along with a live-updating info view and proper drag-and-drop manipulation.

Hotpants uses the completely new Neticons system in which icons are downloaded one at a time instead of being stored in sets. Icons can have metadata (name, author), and icon collections can vary by server.
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Feedback to Mark Levin
Hotpants development has been halted and the source code has been posted here. It's in Cocoa, with a December 2002 PB file. Have fun...