
Description: Invoice At Once is an invoicing and billing software that allows small businesses and freelancers to create, send, and track invoices. It has features for recurring invoices, online payments, expense tracking, time tracking, and accounting integrations.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: F-Billing Revolution is an open source billing and invoicing software for small and midsize businesses. It offers features for estimates and quotes, invoices, payments, expenses, time tracking, reporting, recurring bills, and more.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API