DAVID-Laserscanner is a freeware software for 3d laser scanning. All you need to build a 3d scanner is a PC, a camera (e.g. a webcam), a background corner, and a laser that projects a line onto the object you want to scan. So everyone can use it to scan objects without high costs; this is the big advantage over commercial solutions which are rather expensive.
Installation:
Download the zip file above and extract it to a folder on your hard disk.