KVIrc is a graphical IRC client for Linux, Unix, Mac OS and Windows. Developed by HelLViS69 - code - hellvis69 @ netsons.org
License: Open Source
Quassel IRC is built around a modular architecture that supports cross-platform use and a mobile client, making it suitable for users who prioritize flexibility and community support. In contrast, KVIrc offers rich scripting capabilities and a comprehensive plugin ecosystem, catering to users seeking extensive customization and advanced features.