
Description: GNU Emacs is a popular, open source text editor and computing environment. It runs on most operating systems and provides extensibility through an Emacs Lisp interpreter.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: HTMLPen.com is a free online HTML editor that allows you to write, edit and preview HTML code in real-time. It has a clean interface with syntax highlighting and other handy coding features.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API