Videoder

As most of the users know, Google doesn’t want people to download content from YouTube, but that doesn’t mean that developers won’t build tools that can make this happen. All of the apps that provide this kind of functionality are absent from the Google Play Store.
 
The developers of Videoder have implemented a browser that can be used in conjunction with YouTube. In this way, the application has control over the video stream and not Google. Downloading videos, in all supported resolutions, is easy, and anyone can do it.
 
Also, users can directly convert the video streams to MP3, which is also a really nifty feature, not to mention that they download content which can be viewed in offline mode.