WHMCS - WHMCS is an all-in-one client management, billing & support system for online businesses.
Microsoft Azure Active Directory - Azure Active Directory is a comprehensive identity and access management cloud solution that provides a robust set of capabilities to manage users and groups and help secure access to applications including Microsoft online services like Office 365 …
HostBill - HostBill is a powerful and flexible, all-in-one automation, billing, client management and support platform for online businesses.
SecureLink for Enterprise - Privileged Access Management
Blesta - Blesta is professional client management, billing, and support software.
JumpCloud - Cloud-based directory services. Alternative to Microsoft Active Directory.