The best replacement for znc is psybnc.

The best alternatives to znc are rated as following:
★★★★★  psybnc
★★★  quassel
★★  irssi
★  bip

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

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



Google Trends

Scale is based on the average worldwide traffic of znc in all years. Click on graph for more.
znc
psybnc
quassel