If you're a Mac user who works with SKP files, finding a reliable and free SKP file viewer is essential. Luckily, there are several great options available for Mac users that won't cost you a dime. Here are some of the best free SKP file viewers for Mac:

1. SketchUp Viewer: SketchUp Viewer is a popular choice for Mac users who need to view SKP files. It offers a clean and intuitive interface, making it easy to navigate and view your SKP models. Plus, it's available for free from the Mac App Store, making it a convenient choice for those on a budget.

2. eDrawings Viewer: eDrawings Viewer is another excellent option for Mac users. This versatile viewer not only supports SKP files but also a wide range of other 2D and 3D file formats. It's free to download and offers a user-friendly interface, making it a great choice for both beginners and advanced users.

3. DWG FastView: While primarily known for viewing DWG files, DWG FastView also supports SKP files, making it a valuable tool for Mac users. This free viewer offers a range of features, including measuring tools and markup capabilities, making it a comprehensive solution for viewing and annotating SKP files.

4. Open 3D Model Viewer: Open 3D Model Viewer is an open-source project that supports a wide range of 3D file formats, including SKP. Its simple and straightforward interface allows you to quickly load and view your SKP files without any hassle. And of course, it's completely free to use.

5. Autodesk Viewer: Autodesk Viewer is a web-based solution that allows you to view SKP files directly in your browser. While it's not a traditional desktop application, it provides a convenient way to access and view your SKP models from any device, including your Mac.

With these free SKP file viewers for Mac, you can easily view and inspect your SKP models without having to invest in expensive software. Whether you're a professional designer or a hobbyist, these options provide the functionality you need without breaking the bank.