An IRC library that is both free and open source is available for creating IRC clients.
One major advantage of LibIRCClient is its distribution and licensing. It comes under the GNU Library or Lesser General Public License (LGPL) which means you can use this library without any licensing fees and restrictions.
In summary, LibIRCClient is an excellent IRC toolkit that you can depend upon to implement IRC's client-server protocol. It's portable, small-sized, and fast, making it an ideal choice for most IRC clients and RFC standards.
Version 1.3: N/A