
Description: Billbooks is an open-source accounting and invoicing software designed for small businesses. It offers features like double-entry accounting, recurring invoices, financial reports, and more. Billbooks is free and available for Linux, Windows, and Mac.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: Simple Invoices is an easy-to-use invoicing and billing software for small businesses and freelancers. It allows you to create professional invoices, track payments, expenses and view financial reports.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API