WHMCS - WHMCS is an all-in-one client management, billing & support system for online businesses.
cPanel - With its first-class support and rich feature set, cPanel & WHM has been the web hosting industry's most reliable, intuitive control panel since 1997.
HostBill - HostBill is a powerful and flexible, all-in-one automation, billing, client management and support platform for online businesses.
Google App Engine - A powerful platform to build web and mobile apps that scale automatically.
Blesta - Blesta is professional client management, billing, and support software.
Salesforce Platform - Salesforce Platform is a comprehensive PaaS solution that paves the way for the developers to test, build, and mitigate the issues in the cloud application before the final deployment.