EPIC
Enhanced
Programmable
IRC-II
Client

By itself, EPIC is a faithful replacement for ircII, which is very bare-bones. Consequently, EPIC is generally used in conjunction with a script - an EPIC script creates a different, more complete user experience.

This page contains links to some scripts that you may want to consider. Every script pack is different, because every user is different. Try a few and see what you like! Most scripts are very tweakable to suit your needs.

• Amnesiac: http://amnesiac.ircii.org/
• Darkstar: http://www.epicsol.org/~brian/darkstar/
• LiCe5: https://lice.muppetz.com/

There are a few scripts for EPIC4, unfortunately, most (if not all) of them are no longer maintained or supported. Google is probably your best bet at this point. The previous repository for epic4 scripts was a third party website that was compromised by bad guys.