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KiCAD EDA

SIM (Simple Instant Messenger) is an unpretentious
open-source ICQ client which supports many of the
features of Version 8 of the ICQ protocol (ICQ 2001).

SIM has a lot of features, many of them are listed
at: http://sim-icq.sourceforge.net/

ZNC is an IRC bouncer with many advanced features like detaching, multiple
users, per channel playback buffer, SSL, IPv6, transparent DCC bouncing, and
c++ module support to name a few.