It combines the Image Source Method with Ray Tracing for unmatched accuracy.

Download I-Simpa . Its ability to handle 3D meshes for free is unmatched.

While there is no "full" version of ODEON available for free forever, the is the best starting point for learning. For those who need to complete a full project without a budget, I-Simpa and Pachyderm provide the most comparable features to ODEON’s high-end toolkit.

Here is everything you need to know about getting ODEON for free and the best alternatives currently available. 1. The Official Way: ODEON Free Editions

Created by AFMG, this is a free 3D acoustic simulation software specifically for modeling line arrays and speakers. While not a general "room" acoustics tool like ODEON, it is the gold standard for live sound reinforcement.