Clipgrab requires the user to simply type in the url of the video. This can be copied from the web browser. Once done, Clipgrab gives the details of the video including the different sizes its available for download and the different formats it can be converted to. Hit the “Grab this Clip!” option to download the video.
Clipgrab also monitors your clipboard to pick up urls when ever they are copied. Then it throws a notification asking you if you want to download the clip.
Clipgrab is available for Linux, Windows and Mac and can be downloaded from here: http://clipgrab.de/start_en.html
For ubuntu systems you can use the PPA repository to download Clipgrab:
sudo add-apt-repository ppa:clipgrab-team/ppa
sudo apt-get update
sudo apt-get install clipgrab