A combination of great servers and trusted Software will make your VPN services business stand. I think you should try Smarters software solution. I am also using Smarters Panel and their custom Apps for my VPN Business. It's working very well.
Well, I'm Using VPN Smarters Softwares And their custom Apps. They are one of the best software providers because they are doing great work on custom apps and delivered the best products and services. I have great experience with them.