Are you in need of free software to open step files for your CAD or 3D modeling projects? Look no further! Here are some top options that won't cost you a dime.

1. FreeCAD: FreeCAD is an open-source parametric 3D CAD modeler. It supports the STEP format and offers a wide range of features for designing and modeling.

2. 3D Viewer: 3D Viewer is a simple and easy-to-use tool for viewing 3D models, including STEP files. It's lightweight and perfect for quickly visualizing your step files.

3. Fusion 360 for Personal Use: While Fusion 360 is a professional-grade software, it offers a free personal use license that allows you to open and view step files without any cost.

4. Onshape Free: Onshape is a cloud-based CAD software that offers a free plan for hobbyists and makers. It allows you to import, view, and modify step files without breaking the bank.

5. SolidWorks eDrawings Viewer: This free software from SolidWorks allows you to view and share 3D models and 2D drawings, including STEP files. It's a great option for collaborating and reviewing designs.

In conclusion, there are plenty of free software options available for opening step files. Whether you're a hobbyist, student, or professional on a budget, these tools will help you access and work with step files without the need for expensive software. Give them a try and see which one works best for your needs!