http://www.anilyzer.com/

Check out this great tool for animators! You can now study animation frame by frame, or change the playback speed! Just type in the Youtube or Vimeo web address!

From their website:

<blockquote>The Anilyzer is a free service that allows the user to view videos frame by frame and slow motion. It was created by animators for animators, from the developers of AniRef—the animation mobile app created by Paolo Cogliati.

Whether you are a 2D or 3D animator, film maker, director, artist or athlete, the Anilyzer aims to help you discover the hidden movements in life. </blockquote>