Roll Sketch lets you pose two 3D grappling dummies into any Brazilian jiu-jitsu position. Drag hands, feet, hips and heads into place, add grips that follow the other body, and save frames to animate a transition, sweep or submission. Then take a clean screenshot or send a link so your training partner or coach can orbit around the position themselves.
Starting positions include closed guard, mount, side control, back control and standing grip fighting, plus submissions: rear naked choke, armbar, triangle choke, kimura, guillotine, americana and straight ankle lock. It works on phones and computers, in the browser, with nothing to install.