Video Downloader Are you tired of copy&paste URLs to download a video? Now it’s even easier !
VideoDownloader Firefox Extension add a small icon on the status bar at the bottom of your firefox window, and a toolbar button.

TubeSock downloads YouTube or DailyMotion videos from the web and saves them to your video iPod, Mac, or PlayStation Portable. TubeSock knows how to convert the video using the codecs and bitrates best for each device. It can even add the video to iTunes for you.

VideoDL is a quick AJAX application which allows you to download online video into your computer. It supports top 3 video sites - YouTube, Google Video, and Break.com.
Download YouTube via bookmarklets - A collection of Greasemonkey scripts and bookmarklets to do the job.

Get Tube is one utility to download the videos with the format mp4 or mp3 on YouTube site.

Delutube Deleted Youtube video viewer.

Youtube-dl is a small command-line program to download videos from YouTube.com. It requires the Python interpreter, version 2.4 or later, and it’s not platform specific. It should work in your Unix box, in Windows or in Mac OS X.

KeepVid Download videos direct from most video sites like YouTube.

Youtube and Google videos save them as AVI files encoded in the MPEG4 format, using only one command.

YouTube Downloader Allows you to download videos from YouTube and many others and convert them to other video formats.

Youtube Grabber Absolutely free to download FLV files from youtube.

FLVR Allows you to download Flash video to your Mac. FLVR works smoothly with your browser, making it simple to save your favorite movies or clips. Simply drag the link to FLVR, and you’re done!
FLVR produces iPod-friendly Quicktime videos (MPEG-4), so you can take your favorites with you wherever you go!

GooTube FLV Retriever Enter the video url and download the youtube video file in flv format.