From HEXONET Wiki
WHMCS Modules
Getting Started
Getting Started Guide: Start selling domains with HEXONET & WHMCS
Securing your WHMCS installation
How to secure your WHMCS installation
List of available modules
ISPAPI Registrar Module - compatible with all WHMCS versions Changelog
ISPAPI High Performance DomainChecker Module - compatible with WHMCS 7 Changelog
ISPAPI Backorder Module - compatible with WHMCS 7
ISPAPI SSL Module - compatible with WHMCS 7
ISPAPI Pricing Importer Module - compatible with WHMCS 7 Changelog
LIVE DEMO:
A public demo site is available at:
http://try-whmcs.hexonet.net/ (demo/demo)