After reading about Blesta i'm positively surprised it's pretty much open and we do support OSS. Rather than obeying to increasing pricing policy by WHMCS, we'd rather pay to Blesta to be used and get it improved!
As we are looking to move away from WHMCS to Blesta, we totally depend on provisioning our users with Kloxo-MR.
NB: PLEASE DO NOT MANY IGNORANT COMMENTS FLOATING AROUND THE WEB ABOUT HOW "BAD" Kloxo IS; THIS IS NOT Kloxo, RATHER KLOXO-MR THAT IS ACTIVELY AND VERY WELL MAINTAINED BY THE DEVOLOPER AT https://forum.mratwork.com/!
FYI: We've used Kloxo-MR in production for about 3 years without any bigger issues. There's ofc been some smaller issues, that's nature of software being developed, nothing is perfect from the start. Also, we've done minor testing of other FOSS web hosting control panel and in our view, nothing comes close to Kloxo-MR when it comes to completeness. It's an incredible piece of software delivered to the public!
We really look forward to getting this 100% open source control panel supported by Blesta!