I'm a huge iOS fan. WHMCS doesn't elicit the same feeling.

just like iphone, whmcs may not great for you but:

I wouldn't say WHMCS is 'great'.

Most hosting providers on here use WHMCS. Why?

LastPass is the only alternative. More important it is supported and maintained by the best Remote Access in the business, LogMeIn. Proven security track.

Using LastPass here, runs really well. Just remember to disable auto filling in websites like whmcs admin, you will set your admin password for client passwords etc. I just disabled it for all website

HostBastic.com

Last time they didn't had separate invoice numberibg for pro-forma invoices, regular invoices and refund credit notes. But this problem is also for whmcs, clientexec. Only hostbill has nice invoicing

* OS: Any Linux and Windows OS request possible, just fill the details in instruction form. There is a possibility of additional charge for licensed OS.

I wrote a virsh frontend WHMCS-like panel (billing, administration, and on-demand hourly VMs) for fun (it's a mess, and it's name is Scorpio). Thanks to @francisco for giving me the idea.

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release shortly that will be OSS - probably ISC license. Would be glad if you checked it out.

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What is Blesta?Just like WHMCS？

It's not an OWNED license.

What is the downside of having blesta license from a reseller ?

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I have integrated the Virtualizor panel inside WHMCS. One login to both billing and VPS management.