Free YouTube Downloaders & Converters...

 ClipConverter [Web]

Interface & usability: ClipConverter is an easy-to-use Web service for downloading and converting YouTube videos by pasting a URL.

 

Features: For most formats, ClipConverter gives you full control over quality of both audio and video, as well as the volume of your output, its aspect ratio, and its length. It’s very easy to download and convert only a section of the video.
Available formats: FLV, MP4, MP3, M4A, AAC, WMA, OGG, 3GP, AVI, MPG, WMV, MOV.

KeepVid

  Interface & usability: KeepVid is a Web service that lets you easily download YouTube videos in a number of formats. There’s not much to KeepVid aside from pasting a URL and clicking on “Download”. KeepVid recognizes the video and presents a thumbnail, the video’s title, and the video’s length. 
Features: Not many to speak of. The bookmarklet is an easy way to start a video download/conversion straight from YouTube, but other than that, there are no special features worth mentioning. This might be a plus if you’re looking for something really simple.
Available formats: FLV, MP4, 3GP, WEBM.

Xenra

 Interface & usability: Xenra sports a simple interface that nonetheless gives you much control over your final video or audio output. Simply paste your video URL in the box, and click Download to reveal more options.

Features: Xenra is geared at creating audio files from YouTube videos, and as such, provides fine control over ID3 tags such as title, artist and album. You also get full control over volume and bitrate for both audio and video.
Available formats: MP3, AVI, FLV, MOV, MP4, 3GP, MPG, MPEG, WAV, WMA, WMV.

Any Video Converter [Windows, Mac]

 Interface & usability: Moving on from Web apps, Any Video Converter (AVC) is a desktop app for Windows or Mac that can handle all your YouTube downloading and converting needs. To download a YouTube video, copy the URL to your clipboard, and click the Download button in AVC. 

Features: AVC features a huge list of mobile devices for conversion purposes, so you can get the maximum possible video quality for your specific device. After downloading a video, you can also use the clip tool to create video segments, crop the video to your exact needs, and control colors and add effects.

Available formats: WEBM, MP4, 3GB for download, but can convert it to pretty much any video and audio format on Earth after download.  

Freemake [Windows] 

Interface & usability: For some reason, YouTube downloaders and video converters have a tendency to be ugly and/or cluttered. Not so with Freemake. This slick piece of software is such a joy to use and look at, looks alone are a great reason to give it a try. To get started, copy a video URL to your clipboard and click the shiny blue “Paste URL” button. This will automatically detect the video, and open the format dialog. Once you choose your format and quality, videos will start downloading to the path of your choosing.

Available formats: WEBM, MP4, FLV, 3GP, AVI, MKV, MP3, WMV. Devices: iPod/iPhone, iPad, Android, PSP.

 Article By:Yaara Lancet