Freeware Descriptions:
MiniMagics is free .STL viewer software that allows you to view and compress .STL files, import and save.STL, .magics and .mgx files, as well as view parts and detect bad edges and flipped triangles.
Here is complete features (taken from authors site):
As a free .STL viewer, you can share MiniMagics with your sales force, customers and the people on the shop floor.

File Size / OS:
- 25.02 MB / Windows 9x - ME - 2000 - NT - XP - 2003 - Vista
Download MiniMagics Free STL Viewer 12.0.5.9: