
Description: Invoice Ninja is an open-source invoicing, expenses, and time-tracking app designed for freelancers and small businesses. It allows you to create professional invoices, track payments and expenses, manage projects, and accept online payments.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: OpenSourceBilling is an open source billing and invoicing software designed for small to medium sized businesses. It allows creating and sending professional invoices, tracking payments, managing clients, products and invoices. It can integrate with payment gateways.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API