Iceberger - Draw an iceberg and see how it will float

3d Scanner App - Free LIDAR 3d scanner for iPad Pro

Stickman Builder - Free parametric graphic Stickman Builder, creates fascinating stick figures on the fly.

Trnio - Turn your iPhone into a 3D scanner

Drawy - Learn to draw, use camera to score your drawings

Capture - A great free screen capture utility that allows you to capture either a window or the desktop and save it to either a file or the clipboard.