
Description: MY MP4BOX GUI is a free, open source graphical user interface for the MP4Box multimedia packaging tool. It allows you to easily create, edit, and work with MP4 files without needing to use the command line.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: Subler is a free, open-source macOS application for editing metadata, subtitle tracks, and chapter markers in MP4 and M4V video files. It provides an easy-to-use interface for manipulating subtitle tracks, adding or editing metadata like titles and descriptions, and more.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API