
Description: Marble is a free and open source note taking app designed for Linux desktop environments. It allows users to create rich text notes, tackle checklists, set reminders, and organize notes into notebooks. Marble is built for simplicity while still offering powerful features.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: QTViewer is an open-source image and video viewer, organizer and editor. It supports a wide range of image, video and audio formats and has basic editing features like cropping, resizing and color adjustments.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API