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WHMCS - WHMCS is an all-in-one client management, billing & support system for online businesses.

WildApricot - WildApricot is a powerful cloud software to help you automate and simplify membership tasks.

BILLmanager - BILLmanager is an all-in-one web hosting billing software. It provides billing automation, service provisioning, client portal & back office and support center.

Tendenci - Tendenci - The Open Source AMS is a cloud-based​ all-in-one management SaaS solution for Non-profits and Associations.

HostBill - HostBill is a powerful and flexible, all-in-one automation, billing, client management and support platform for online businesses.