
Description: RiotJS is a lightweight front-end JavaScript library for building user interfaces. It uses a simple and minimal syntax to allow developers to build components quickly without needing complex build setups or transpilation.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: Ninja UI is an open-source user interface design and prototyping tool for web applications and websites. It allows designers and developers to rapidly create wireframes, prototypes, mockups and hi-fidelity designs.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API