GNU Gadu 2 is a modular instant messaging client
with a GUI written in GTK2. It currently supports
Gadu-Gadu, Tlen.pl, and Jabber. It is able to load
Perl scripts, dock in several window managers,
play sounds, talk to other programs via a UNIX
socket, send SMS messages to Polish GSM operators,
automatically check for updates, and use XOSD for
displaying notices.