InspIRCd is a modular Internet Relay Chat (IRC) server written in C++ for Linux, BSD, Windows and macOS 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 customizable to the needs of many different users