
Description: Sinatra is a light-weight, open source web application library and domain-specific language written in Ruby. It allows developers to quickly create web applications and APIs with minimal effort.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: Javalin is a lightweight, fast web framework for Java and Kotlin focused on simplicity and Java/Kotlin interoperability. It's designed for building REST APIs and web applications with a minimal amount of boilerplate code.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API