netfabb Basic is a freeware for handling of files on stl-format. The freeware includes Advanced Model Browsing, STL Fixing and Part Analysis, Measurement and Quality Management. The freeware also include a Basic Slicing module and give you first steps into the 3D Printing and data preperation

via netfabb Download Center » netfabb Basic.

It also comes as a cloud service, a “cloud” (read: server) version and various different professional versions.