If you work with 3D modeling or CAD files, you're probably familiar with the STP file format. This popular file format is commonly used for exchanging 3D data between different CAD systems. However, finding a reliable and free STP file viewer can be a challenge. Luckily, there are several great tools available that allow you to view and access STP files without breaking the bank. Here are some of the best free STP file viewers: FreeCAD - a powerful open-source parametric 3D modeler, BRL-CAD - a powerful cross-platform open-source solid modeling system, Autodesk Viewer - a free online viewer for 2D and 3D designs including STP files. Give these tools a try and make working with STP files a breeze without spending a penny.