When it comes to working with CAD (Computer-Aided Design) files, specifically step files, finding free software that can open them can be a game-changer. STEP (Standard for the Exchange of Product Data) files are commonly used for 3D modeling and design, and having access to the right software can make a big difference. Here are a few free software options to consider:

1. FreeCAD: This open-source parametric 3D CAD modeler is a powerful tool for creating and editing 3D models. FreeCAD supports the STEP file format, making it a great choice for those working with these types of files.

2. BRL-CAD: Known for its powerful solid modeling capabilities, BRL-CAD is an open-source software that can handle a variety of file formats, including STEP. It is widely used in academic, industrial, and government organizations.

3. OpenCASCADE: As an open-source 3D modeling software development platform, OpenCASCADE includes tools for handling and converting STEP files. It's a versatile option for those working with complex CAD models.

4. LibreCAD: Primarily focused on 2D design, LibreCAD is an open-source software that can also handle certain 3D file formats, including STEP. It's a lightweight and user-friendly option for simple CAD projects.

5. DraftSight: While primarily known for 2D drafting, DraftSight also has the capability to open and view 3D models, including STEP files. It offers a familiar interface for users familiar with other CAD software.

These free software options provide access to powerful tools for working with step files and other CAD formats without breaking the bank. Whether you're a student, hobbyist, or professional designer, having the right software can streamline your workflow and open up new possibilities for your projects.