Windows/Mac/Linux: Video encoders are a dime a dozen but DamnVid not only encodes local video in a wide variety of formats, it converts online video in real time as you download it.
You'll find no shortage of video conversion tools if you take the time to look. The majority of them, like DamnVid, rely on the venerable FFmpeg library. Unlike the majority of video conversion tools, however, DamnVid makes it extremely easy to download and quickly convert online videos from dozens of video sites.
In the screenshot above we started filling the conversion queue simply by visiting a few video websites and copying the URL as we found videos we wanted to download and covert. You don't even have to copy and then paste the URL into DamnVid, it grabs supported site URLs right from the clipboard. When you're ready to convert the videos, DamnVid encodes the video in the new format as you're downloading it significantly cutting down on the time it takes to empty the encode queue.
Check out the link below for more information on DamnVid. If you have a great tool for video conversion you want to share, let's hear about it in the comments. DamnVid is freeware and available for Windows, Mac and Linux operating systems. Thanks Jordan Victor!