OpenSTL

OpenSTL is a lightweight Windows application built specifically for helping you open and check out the contents of STL files.
Since this is a portable program, it is important to mention that it doesn’t leave any traces in the Windows Registry. You can copy it on any USB flash drive or other devices, and take it with you whenever you need to open STL files on the fly.
OpenSTL sports a clean and straightforward layout that gives you the possibility to add files to the list using the “drag and drop” support or built-in browse function.
The utility provides data about the selected STL item, namely size, surface, and volume, and you can make the program display shades or wire frames, zoom in or out, as well as rotate the objects to different angles in a 3D environment.
What’s more, the application offers support for basic editing operations (delete, copy), and lets you merge, rotate, translate, scale, or mirror the selected parts.
Last but not least, you can print the designs, switch to a full screen mode for a better focus on your work, change the background color, pick a color for the selected part, as well as choose a default viewing mode (top, bottom, left, right, front, back, or isometric).
During our testing we have noticed that the program offers very good image quality, and no errors showed up throughout the entire process. It leaves a minimal footprint on system resources, so the overall performance of the computer is not hampered.
As a conclusion, OpenSTL offers a simple yet powerful software solution when it comes to opening STL files in a clean and intuitive working environment.