Avast Home Edition is a complete ICSA & Checkmark certified antivirus, Checkmark certified anti-spyware & anti-rootkit package.
Avast includes the following components: On demand scanner with skinnable simple interface, just select what do you want to scan in which way and press the Play button; On access scanner, special providers to protect the most of available e-mail clients; Instant messaging – ICQ, Miranda; Network traffic-intrusion detection, lightweight firewall; P2P protection for Kazaa, BitTorrent; Web shield-monitors and filters all HTTP traffic; NNTP scanner-scans all Usenet Newsgroup traffic and all operations with files …

Trillian is a proprietary multiprotocol instant messaging application for Windows created by Cerulean Studios that can connect to multiple IM services, such as AIM, ICQ, Windows Live Messenger, Yahoo! Messenger, IRC, Novell GroupWise Messenger, Bonjour, Jabber, and Skype networks (the latter four with Trillian Pro which allows for additional plugins).

Pidgin is an instant messaging program for Windows, Linux, BSD, and other Unixes. You can talk to your friends using AIM, ICQ, Jabber/XMPP, MSN Messenger, Yahoo!, Bonjour, Gadu-Gadu, IRC, Novell GroupWise Messenger, QQ, Lotus Sametime, SILC, SIMPLE, MySpaceIM, and Zephyr.
Pidgin can log in to multiple accounts on multiple IM networks simultaneously. This means that you can be chatting with friends on AIM, talking to a friend on Yahoo Messenger, and sitting in an IRC channel all at the same time.