Youtube dl – Free and fast YouTube downloader for Ubuntu

youtube-dl is a small command-line program to download videos from YouTube.com and a few more sites. It requires the Python interpreter, version 2.x (x being at least 5), and it is not platform specific. It should work in your Unix box, in Windows or in Mac OS X. It is released to the public domain, which means you can modify it, redistribute it or use it however you like.

How to install youtube-dl on Ubuntu?

You can install youtube-dl trough packages in Synaptic manager .For installing youtube-dl you can use the following command :

 sudo apt-get install youtube-dl

 How to use youtube-dl on Ubuntu?

1. Open terminal and type this command

youtube-dl "url"

DownVerter – Free and fast YouTube downloader for Ubuntu

DownVerter® is free and easy to use application to download and convert videos from YouTube.
DownVerter® allows you to choose between mkv and mp4 files to download from YouTube. You could choose to just download the file or download it convert it into MP3, AVI, 3GP, MP4, MOV or WMV format.

If you would like to see a new conversion format added please let us know by sending email to contact@downverter.com. We will analyze your request and if we see a lot of requests for a particular conversion format then we will add it.
Download YouTube videos in High Definition (HD 1080p, 720p), High Quality (HQ) Mp4 files. Automatically convert YouTube videos to MP3, AVI, 3GP, MP4, MOV, WMV for your iPod, PSP, Pocket PC or Mobile Phone!

Install DownVerter in ubuntu 11.10

First you need to download the .deb package from here Once you have deb package you can doublick to install this.

Screenshots

 

source : http://www.ubuntugeek.com/downverter-free-and-fast-youtube-downloader.html