With everyone accustomed to paying $1.50 per server for 100s of PHP applications, a $20+ per server solution is no longer an option.
We've been using the products offered on CoffeeCP for our own customers going on 10 years.
* Webmin and Virtualmin have 100% Open Code. cPanel allows you to customize all customer-facing elements. The WHMCS module is encrypter usign ioncube.