#ffmpeg is a nice tool, but doesn't have a progressbar. It just shows what it's doing by endlessly printing text lines!
How about a progressbar? And without dependencies?
The gray toolbar is the main one, the green ones are the sub-toolbars, and several can be open simultaneously. #CuisSmalltalk's Morph simple design is human understandable and it helps concentrating on the design task. Great tool.
Be a Geometer!: Et si on codait avec des élèves