With hundreds of IRC clients out there, it's sometimes hard to believe that a new one was needed. Here are the highlights of this software:
+ absolutely NO scripting ability. + termcap based (e.g. fast!). + emacs-style key bindings + compliant with RFC 2810, 2811 and 2812. + virtual windows à la screen(1). + multi server support. + non blocking TCP connections. + basic support for multi-homed systems. + IPv6 support (requires RFC2533 compliant API). + everything goes and stays in the lastlog. + convenient scrolling (with searching capabilities) in the lastlog. + 10 display filters! (2 ignore features based on this). + built-in counters to hide repeating messages. + highly customizable. (format strings, filters, reformating, ..) + customization possible at every level (channel, window, server..). + non blocking DNS lookups (A and PTR records). + convenient multi-server "tabkey" style completion (for /msg, /squery). + "space key" style completion (for public discussion). + DCC support. + CTCP support.
sic is still alpha, so you should expect alpha quality. However, it is quite stable and no longer crashes when something isn't implemented yet. For more info/details on the project, check out the SourceForge Project Page.