VidToPhone let you download musics and video for free from youtube directly in your music and video folder, so that you can listen it from your music player, you can also listen to youtube videos without having to download it and with the screen locked
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Super File Manager freemium Free
Free, Safe, Small, Simple. One of the best File Manager apps on GetJar.
Vidmate - HD Video downloader and live TV Free
Vidmate is an app that lets you download videos and songs from loads of multimedia sites