
Description: VisualDiffer is a free, open source cross-platform visual diff tool for developers. It allows comparing images, directories, and version controlled projects to detect file changes over time. Key features include split screen viewing, pixel and file differencing, filtering file types, ignoring file differences, etc.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: Meld is an open-source visual diff and merge tool. It allows users to visually compare files, directories and version controlled projects. It highlights differences, helps with merging changes and resolves conflicts through its intuitive interface.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API