BILLmanager is an all-in-one web hosting billing software.

OVIPanel is a freemium control for web hosting.

Qiscus provide everything you need to power up your app with chats.

Ubersmith is the leading subscription business management suite, including usage-based billing, quoting, provisioning and related software.

InvoicePlane is a self-hosted open source application for managing your quotes, invoices, clients and payments.

SugarCRM is a customer relationship management (CRM) system.

Stoq is an open source framework for enterprise level automated analysis.

WHMCS is a web hosting automation platform.