DubDubDone is a free dubbing game you play in your browser. Load a clip, hand the characters out around the room, and perform every line against the picture. You hear the original, take your shot at it, and keep the finished dub.
It runs on any modern browser with a microphone. There is nothing to install and no account needed to play. Recordings are made on your own device and stay there unless you choose to export them.
Play on your own or with up to twelve people in a room. There is a live karaoke mode with real pitch scoring, and a pack maker for turning your own clips into playable scenes.