Blender

Crazy complicated 3D editor...

import

• file, import, import STL in top right corner
• zoom way out, object might be big

decimate

To reduce resolution and therefor file size:

• select object (orange frame should show)
• object modifiers (wrench on button bar in right panel)
• add modifier, under generate, decimate
• down to ~100 000 says Tony Buser's person scan process

URL

• http://www.blender.org