ARCHICAD 28 is a professional BIM software. There is no permanent "full free" version for commercial use. However, Graphisoft offers a fully functional 30-day trial and a permanent free Educational version for students/teachers.

If you need a direct download link for the official trial, reply with your operating system (Windows or Mac), and I can provide the exact page.

Clients, collaborators, or students who only need to review models.