Finch - Ncurses-based chat client that uses libpurple and supports all its protocols (install purple-icyque-git AUR for the WIM protocol).EKG2 - Ncurses based XMPP, Gadu-Gadu, ICQ and IRC client.qutIM - Simple and user-friendly IM supporting ICQ, XMPP, Mail.Ru, IRC and VKontakte messaging.Pidgin - Multi-protocol instant messaging client with audio support that uses libpurple and supports all its protocols (install purple-icyque-git AUR for the WIM protocol).

Kopete - User-friendly IM supporting Bonjour, Gadu-Gadu, GroupWise, ICQ, XMPP.Jitsi - Audio/video VoIP phone and instant messenger written in Java that supports protocols such as SIP, XMPP, ICQ, IRC and many other useful features.OSCAR still functions (as of March 2019) but it is highly recommended to make use of the new WIM instead): (please note that ICQ's OSCAR protocol is depreciated and replaced by WIM - you should check if third-party clients support the new protocol instead of the old one.

You can use one of following methods in order to use ICQ in Arch:

Icq web messenger