
Description: 4k YouTube to MP3 is a free web-based tool that allows you to convert and download YouTube videos as MP3 audio files. It supports extracting audio from YouTube videos up to 4K resolution.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: MassTube is a free YouTube video and music downloader software for Windows. It allows downloading videos, playlists, channels, comments and subtitles from YouTube with ease. Key features include multi-threaded downloading, conversion to various formats, and downloading entire YouTube channels.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API