YoutubeExplode is an open source .NET library that can be used to download and manipulate YouTube videos. Using the library, developers can search for videos, extract video information such as titles and thumbnails, download videos in different formats, and even extract audio tracks from videos. YoutubeExplode also supports extracting multi-part videos, and provides a set of useful utilities for working with videos. The library is free to use and can be used to create powerful applications that provide access to YouTube’s vast library of videos.
Bundleware The default Windows installer contains Opencandy. A version without third-party offerings is available in the download options.
Bundleware El instalador contiene OpenCandy. Tenga cuidado durante la instalación: https://alternativeapp.info/discussions/applications/11718/be-careful-in-the-installation/
Bundleware The desktop software contains adware.
Discontinued It seems that the project is no longer maintained and the official website is no longer available. The latest version, v2.7, can still be downloaded from Softpedia and the source code is available on SourceForge (v2.5).
Discontinued The extension currently does not work in Firefox 57, it still works in lower versions: https://forums.informaction.com/viewtopic.php?f=6&t=23325&sid=00474d828d2582731536b4ea5146d5af