Online video streaming is a very common activity for the current availability of the Internet service. Downloading the video from the web service such as YouTube is one of the common activities among the Internet users.

There are two powerful tools I am using for downloading these videos: youtube-dl and Video DownloadHelper.

youtube-dl is a command-line utility which allows to download various formats of the video available on the webpage; Video DownloadHelper offers similar feature as youtube-dl, yet it is a Firefox addon. Both tools support various websites, not only YouTube alone.