Are you struggling to find a cost-effective way to view and edit STP files? Look no further! We've compiled a list of free software options that will help you open and work with your STP files without spending a fortune. Whether you're a professional engineer or a hobbyist 3D designer, you'll find these tools invaluable.

1. FreeCAD - This powerful open-source parametric 3D CAD modeler is perfect for creating and editing STP files. With a user-friendly interface and a wide range of features, FreeCAD is a go-to choice for many designers and engineers. Plus, it's free to download and use!

2. eDrawings Viewer - Developed by SolidWorks, eDrawings Viewer is a versatile tool for viewing, measuring, and marking up STP files. You can easily collaborate with colleagues and clients by sharing your designs in this intuitive software. Best of all, it's available for free on both Windows and Mac platforms.

3. 3D-Tool Free Viewer - This lightweight software allows you to view and analyze STP files with ease. It supports various 3D file formats, making it a convenient solution for designers who work with different file types. The free version comes with basic features, but you can upgrade to the pro version for advanced functionality.

4. Autodesk Viewer - If you're working with STP files created in Autodesk software, the Autodesk Viewer is an excellent choice for online viewing and sharing. You can upload your files to the cloud and access them from any device, making collaboration seamless. It's a free and convenient option for Autodesk users.

5. EnSuite-View - This free viewer from CCE allows you to open and interact with STP files, as well as other CAD formats. It offers visualization tools and basic measurement capabilities to support your design review process. EnSuite-View is a handy tool for anyone who needs to view 3D models on a regular basis.

These free software options provide a cost-effective way to open and work with your STP files, whether you're a professional or a hobbyist. With their intuitive interfaces and essential features, you can enjoy seamless 3D modeling without breaking the bank. Try out these tools and discover the convenience of free STP file viewers today!