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InspIRCd is a modular Internet Relay Chat (IRC) server written in C++ for Linux, BSD, Windows and Mac OS X systems.
It was created from scratch to be stable, modern and lightweight. It avoids a number of design flaws and performance issues that plague other more established projects, such as UnrealIRCd, while providing the same level of feature parity.
It provides a tunable number of features through the use of an advanced but well documented module system. By keeping core functionality to a minimum we hope to increase the stability, security and speed of InspIRCd while also making it customisable to the needs of many different users.
And after all it’s free and open source.