
Description: Rextester is an online compiler and editor for various programming languages that allows users to write and execute code snippets without installing anything. It supports over 20 languages including C, C++, Java, Python, C#, VB.NET, PHP, Perl, Ruby, Swift, and more.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: SQL Fiddle is an online SQL database testing tool that allows users to easily create, share, test, and run SQL queries. It supports various databases like MySQL, PostgreSQL, Oracle, SQL Server, etc.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API