Meshy a is light-weight, native Mac OS X CAD file inspector including everything you need to verify your designs.
Features: Supports ASCII and binary stl files. More file formats will be added soon. Intuitive navigation: Rotate, pan and zoom using mouse or trackpad. Easy access to model properties. Double click model to open inspector panel and change appearance of your designs. Full Mac OS X integration including Drag and Drop, QuickLook preview of your CAD files and automatic software update. No half-finished Windows ports here.