Shapefest - A massive library of 3D shapes for everything!
3d Scanner App - Free LIDAR 3d scanner for iPad Pro
Wannathis - 3d illustrations and freebies
Trnio - Turn your iPhone into a 3D scanner
LostGeometry.xyz - Huge set of 91 abstract 3D objects in various styles.
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.