What you see below is the tried and tested methods, yep i got these from google :-
"www.clipconverter.cc" website gives you option to convert you video to different Audio and Video file formats such as MP3, MP4, M4A and AVI, MOV, MP4, 3GP
It is simple and straight forward, but it can be little freezing for slow networks.
Its pretty simple paste the links and press catch button.
But the at the top the page there is "SELECT VIDEO QUALITY" written, it is actually a image linking to another website. "SELECT VIDEO QUALITY" thing is pretty useless.
KEEPVID is there in this business for long time and it had evolved itself with current situation. It is pretty simple just paste and Hit download button. Now in the lower portion of the page, appears a list of possible downloading options. note:- Carefully download, there are many Video Only and Audio Only links.
Apart from free downloading. They add special features for Windows and mac users for Only $29.
Here first you have to goto address bar, where the url of the youtube video is written. Works smoothly in Mozilla.
for example here:
replace "youtube" with "voobys" like this:
I hope to grow this small "List" longer, Help me as well as yourself by commenting and sharing.