1.To download youtube contents you need to download ytd downloader and install it.
2.Now copy the Youtube (Facebook,Metacafe) video links in the URL bar of YTD Downloader.
3.Now click download your are done.
4.The main advantage of YTD downloader is that it supports more than 50 sites.
1.To download from video site like youtube,dailymotion,vimeo,metacafe and etc just add ss in front of the URL.
2.When you goto this link you will be redirected to savereom.net from where you can download the video.
3.This website also suppots many site.
1.Download audacity and install it.
2.When you play some audio in any website(eg soundcloud.com) which does not provide any audio download, then just press the record button your audio will be saved in the system.
3. You may also use this technique to record voice conversation in skype ,hangouts and where ever you like.
Enjoy the freedom of internet
If you need download from any other sites feel free to comment here.