TED stands for Technology Entertainment and Design. It’s a non-profit organization formed to disseminate "ideas worth spreading" and they do so by holding conferences and talks where they invite some of the world’s most fascinating thinkers to present their ideas. Past presenters include Bill Clinton, Jane Goodall, Malcolm Gladwell, Al Gore, Gordon Brown, Richard Dawkins, Bill Gates, educator Salman Khan, Google founders Larry Page and Sergey Brin, and many Nobel Prize winners.
More than a thousand TED talks are available for free viewing online, under a Creative Commons license, through TED.com and these were watched by more than 500 million viewers.
TED Downloader is a simple tool that lets you download these talks to your computer. You don’t even have to visit TED.com. Simply fire the program, select a Download Quality that you would like and click the ‘Update Links’ button. This will fetch the list of all the videos of that particular quality that are available. You can sort the videos by name, by the location they were held in, by the date they took place on and also by the duration of the videos. Select the videos you wish to download and click on Get TED Talks.
Alternately, if you would like to download videos using a different download manager, then you also have the option to Export the Links to a text file which you can use with your Download Manager.