1.Video Downloader for PC

Download from YouTube with https://yout.com

Download from Facebook with https://www.fbdown.net/

Download using https://en.savefrom.net

2. Video downloader for Android

Using tubemate http://tubemate.net

Tubemate v.1

Tubemate v.2

Tubemate v.3

3. Video downloader for iPhone

Using Browser And Document Manager