
Description: SimpLESS is a simple, open-source CSS preprocessor that allows you to write cleaner, more maintainable CSS code. It adds features like variables, mixins, and nested rules to regular CSS.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: SassMeister is an online Sass playground that allows you to easily test Sass and SCSS code. It provides a code editor with support for Sass features like variables, nesting, mixins, etc. and shows a live preview of the compiled CSS code.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API