
Description: Placehold.it is a simple image placeholder service that generates custom placeholder images for you. Specify image dimensions and background color to get a link to a placeholder image.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: BaconMockup is a free online wireframing and mockup tool. It allows users to easily create website and app mockups by dragging and dropping elements like text boxes, images, and buttons onto a canvas.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API