: A lightweight, open-source billing and client management tool.
A WHMCS developer license is about $45. You can get one for free if a regular license is active and purchased directly with them ( BuiltByBit How to get your WHMCS License key - InMotion Hosting License Key Whmcs Free
: A community-driven fork of BoxBilling focusing on modern features. : A lightweight, open-source billing and client management
Obtaining your WHMCS license - Krystal Hosting Knowledge Base : A lightweight