Maintainer: ircd developers
IRC Channel: #ircd on IRCnet
The original IRC daemon, mainly used by IRCnet. Recent versions have attempted to improve on channel security through the introduction of additional channel types (eg !linux), and channel modes.
IRC Channel: None ?
Mainly used by EFNet. Hybrid's focus is on speed and efficiency, since it lacks many of the services offered by other networks. In keeping with EFnet's ethos that opers should not be concerned with channel matters, Hybrid doesn't allow opers to set modes on channels, or join channels from which they are banned. It is only relatively recently that Hybrid offered the ability for a service bot to reop an opless channel.
Maintainer: Undernet Coder Committee
IRC Channel: #ircu on Undernet - http://www.undernet.org/servers.php
Mainly used by Undernet. Following a series of DDoS attacks in 2001/2002, ircu has offered the ability for users and servers to hide their addresses. Many of the /stats commands have also (sadly) been removed from Undernet.
Maintainer: DALnet Coding Team
IRC Channel: #Bahamut on DALnet
Based on DreamForge and Hybrid, Bahamut is the DALnet server. Features include channel and nick registration, support for nicknames up to 15(?) characters, and a memo service.