Are you a CAD or 3D modeling enthusiast in need of free software to open STP files? Look no further! We've compiled a list of top-notch options to help you view and edit STP files without breaking the bank.

1. FreeCAD: This open-source parametric 3D CAD modeler is perfect for creating and editing STP files. With its modular architecture and Python scripting, FreeCAD offers a flexible and customizable platform for all your 3D design needs.

2. OpenSCAD: If you prefer a more script-based approach to 3D modeling, OpenSCAD is the way to go. This free software allows you to create solid 3D CAD models using a simple script language, making it ideal for designing STP files with precision and control.

3. Blender: Although primarily known for its 3D animation and rendering capabilities, Blender also supports importing and exporting STP files. This versatile software is free, open-source, and equipped with a wide range of features for all your modeling and rendering needs.

4. FreeCADx: Another great option for opening STP files is FreeCADx, an extension of FreeCAD with additional features and enhancements. This user-friendly software provides a seamless experience for creating, modifying, and analyzing STP files without spending a dime.

5. BRL-CAD: If you're looking for robust 3D modeling and simulation tools, BRL-CAD has got you covered. This free software package offers a wide array of utilities for solid modeling, geometry editing, and ray-tracing, making it perfect for working with STP files in a professional environment.

Whether you're a hobbyist or a professional designer, these free software options are sure to meet your STP file needs without straining your budget. Say goodbye to expensive licensing fees and hello to the world of open-source CAD and 3D modeling!

In conclusion, finding free software to open STP files is easier than ever with the plethora of open-source options available. Whether you prefer parametric modeling, script-based design, or advanced simulation capabilities, there's a free solution out there to suit your needs. Embrace the power of open-source software and take your STP file projects to the next level without breaking the bank.