The Atheme IRC Platform is a legacy IRCv3.1-compliant set of middleware for IRC networks. It is typically combined with an IRCv3.1 compliant IRC daemon. Find out more about IRCv3 at ircv3.org.
Atheme IRC Services is an IRCv3.1 compliant services daemon. New development of features in Atheme has been discontinued. Other IRCv3.1 compliant services daemons include Anope 2.0 or newer and X3. There is also a small, but growing list of forks.
You may find the downloads for the latest released versions here:
Older versions are available in the downloads directory.
At the present time, we know of the following projects that have officially declared themselves as forks. Atheme does not warrant the suitability of any forks.
Iris is a legacy IRCv3.1 compliant web-based IRC client. It is in the process of being replaced with various websocket solutions on the typical IRCv3 stack deployment. No formal release has ever been made, but it is available at GitHub.
Atheme Web is a seriously outdated web interface for Atheme, do not use unless you are nuts. There's plenty of other ones out there which are better, search GitHub.