To be honest, Lao Zuo did not actually build a genuine WHMCS system, nor sold a host computer, nor prepared to work in the highly competitive IDC industry in the future, so there has never been a practical application tutorial related to WHMCS, just tested it before WHMCS Open Center Entertain, and then sort out some free websites WHMCS Theme . I haven't made in-depth research on whether it is really usable and whether it is flawed. At least I can normally open the background and foreground interfaces after installation.
In recent days, many friends in QQ are talking about WHMCS related topics. They were originally going to search whether foreigners have free WHMCS topics (foreigners are relatively kind), but most of the topics they see are paid topics, and even free ones lack functions. Inadvertently, I found a free open source WHMCS template BootWHMCS with good evaluation.
BootWHMCS, The open source theme, which adopts the Bootstrap and Font Awesome framework architecture, may not be very beautiful in the interface, but the degree of open source and the evaluation of domestic users, are fairly good. We can use it for study and research. Even if we play it ourselves, it is good to use it as an flawless theme.

BootWHMCS foreground interface

BootWHMCS background interface
Detailed official website address of BootWHMCS: http://bootwhmcs.com/
Background demo address: http://bootwhmcs.com/demo/ ( demo@bootwhmcs.com /demodemo)