The best replacement for icq is skype.

The best alternatives to icq are rated as following:
★★★★★  skype
★★★★  msn
★★★★  aim
★★  qip
★★  аська
★★  miranda
★  qq
★  irc
  msn messenger
  mirc
  ebuddy
  jabber
  trillian

Your alternative for icq is not listed? Suggest!
Speaking about icq, one probably shouldn't forget about trillian.

Other search terms related to icq and their ratings are:
★★★★★ trillian
You have in mind a companion for icq and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of icq in all years. Click on graph for more.
icq
skype
msn