
Description: The Grinder is an open source load testing framework for simulating users and generating load to test the performance and scalability of web applications. It allows scripting test cases with Jython and viewing graphical statistics in real-time.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: wrk is an open-source HTTP benchmarking tool and load testing application. It is used to measure web server performance by simulating concurrent connections to the target server. wrk is lightweight, scalable, and can generate significant load even when run on a single multi-core CPU.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API