Are you working with CAD files and need a free software solution to open STP files? You're in luck! There are several options available that won't cost you a penny. Here are a few to consider:

1. FreeCAD: This open-source parametric 3D CAD modeler is a great option for opening and editing STP files. It offers a wide range of features for designing and modeling, making it a powerful tool for engineers, architects, and hobbyists.

2. eDrawings Viewer: Developed by SolidWorks, eDrawings Viewer is a free software that allows you to view, print, and review STP files along with other CAD file formats. It also offers collaboration tools for sharing and annotating files with others.

3. Fusion 360: While primarily known as a cloud-based CAD/CAM tool, Fusion 360 also offers a free version for non-commercial use. This powerful software allows you to open, edit, and view STP files, as well as collaborate with others in real-time.

4. Onshape: This cloud-based CAD software provides a free plan for makers, students, and educators. It allows you to open, edit, and share STP files, as well as access version control and collaboration tools.

5. PTC Creo View Express: This free software from PTC enables you to open and view not only STP files but also other CAD file formats. It's a lightweight and easy-to-use solution for reviewing 3D models.

These free software options provide you with the ability to open and view STP files without the need for expensive CAD software. Whether you're a professional engineer, student, or hobbyist, these tools can help you work with CAD files efficiently and cost-effectively.

So, if you're looking to open STP files without breaking the bank, give these free software options a try. You'll be able to access and view your CAD files without the financial burden of expensive software licenses. Happy designing!