Atheme project is a portable, secure set of open source IRC services released under the BSD license, designed to run on many IRCd's.
Unlike alternative packages, Atheme's core is minimalistic, providing only required functionality. Extra modules providing functionality you want as a network administrator can be acquired through our (upcoming) module repository.
That said, Atheme provides a fairly complete services set, excluding features designed for oper abuse. It also adds a twist on many of the classic features of Services, such as NOOP.