Photoshop can extract frames from a video, from which you can save animated gifs or just single frame stills. Premiere or Final Cut can easily export single fr

Photoshop can extract frames from a video, from which you can save animated gifs or just single frame stills. Premiere or Final Cut can easily export single frames as stills. As for doing it with free tools, I don't know, but I wouldn't be surprised if there are a number of good ways.