Blend Swap is a community of Blender artists who share their work under Creative Commons Licenses.
You can embed Sketchfab models on your Blend pages. Just click Blends in the top navigation and choose Upload New Blend. Read the Statement of Compliance and click the I Comply With This Document button.
Once you see the Share New Blend submission form, you can add your Sketchfab model URL in the 3D Preview section.