As per my suggestion there is one website name CATCHVIDEO.net i think it will help you to download videos. Thank you.
you can use GotClip downloader. Here is the link:- GotClip Downloader. Just copy the youtube link, paste it into the downloader then press download and you are done.
the best one online is called "Flash Video Downloader YouTube Downloader 3.5.6" Go to Mozilla Add-ons (you will need to be using fire fox) and search for the above title. this is a must. Just say your surfing the net and came across a video clip, with one click the add-on will download instantly without you even leaving your page. No ads and no pop ups as well. I was reading a lot of other suggestions and there no good. I hope this has helped.
you could find many free services in internet. keepvid is good one for you. you dont need to do much.simply put your video url to keepvid and start your download.
I just use keepvid.com its the quickest. I think you can get some kinda Youtube downloader plugins too somehow
You can always download video converters for Youtube. Or check out other online Youtube video converter sites.
Just use keepvid to help you, and I do not think you have to download some thrid-party downloading program.
Youtube Downloader 3.7 is a perfect software for the my opinion.. it's very faster and really good working. Try it.. i use it...