
Description: ZBillingNET is an open-source billing and invoicing application for small to medium businesses. It allows creating and sending professional invoices, accepting online payments, managing customers, products, invoices and much more. It runs on the .NET platform.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: WHMCS is a popular web hosting billing and automation platform. It allows web hosts, resellers, and IT professionals to manage clients, servers, domains, billing, support tickets, and more from one central dashboard.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API