
Description: Siwapp is an open source web-based invoicing and billing application. It allows businesses to easily create professional invoices, track payments, manage expenses, and generate financial reports. Siwapp is built with PHP and JavaScript and can be self-hosted on your own server.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

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: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API