ngIRCd is described as 'free, portable and lightweight Internet Relay Chat server for small or private networks, developed under the GNU General Public License (GPL)' and is an app in the Social & Communications category. There are four alternatives to ngIRCd for Linux, Mac, BSD, Windows and Self-Hosted solutions. The best alternative is ZNC, which is both free and Open Source. Other great apps like ngIRCd are UnrealIRCd (Free, Open Source), ConferenceRoom (Paid) and pylink (Free, Open Source).
znc is an IRC proxy. It runs as a daemon and connects to IRC server, then allows you to connect from a workstation and work as the user that is logged in to the IRC server. After you disconnect, it maintains the connection to the server.
ConferenceRoom is a high-performance conferencing tool with web integration and web-based administration. ConferenceRoom is also compatible with IRC clients like mIRC. It includes sophisticated management features for large events.