
Description: Greenlet is a lightweight concurrency library for Python that allows users to switch between several green threads (coroutines) in a similar way to yield statements. It enables non-blocking cooperative multitasking in Python programs.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: JsSIP is an open source JavaScript SIP library for web developers. It enables voice/video calls, instant messaging, and presence integration into web apps with just a few lines of code. It supports SIP over WebSocket and works well with Asterisk, Kamailio, FreeSWITCH and more.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API