high-performance secure IRC server

 ircd-hybrid is a stable, high-performance IRC server that features:
 .
  * If enabled, SSL client support and server-to-server RSA encryption.
  * Alternative connection methods like ziplinks (compressed)
    and lazylinks (efficient protocol where not all channels are
    synced in the initial burst).
  * Channel exceptions (+e) and invitation exceptions (+I).
  * New configuration file format.
  * Halfops (+h) and anti-spam user mode +g.
  * Dynamically loadable modules.
  * Channel and nickname RESV's (reservations).
 .
 It is also the IRC server of choice on the venerable EFnet, although
 EFnet also uses the Ratbox, ComStud, and the Hybrid 6 IRCDs.