(by CSTB) – A free open-source tool for 3D acoustic predictions using ray-tracing and statistical methods. Closest free alternative to Odeon’s core features.
Note: The trial version does not allow calculations on your own custom geometries and is strictly for educational or evaluation purposes. ODEON Room Acoustics Software Best Free & Open Source Alternatives
ODEON is a professional-grade room acoustics simulation and measurement tool. While a fully "free" version for unrestricted commercial use does not exist, the developer, , offers a Free Trial Version that allows you to: Test all features
This provides access to all features of the simulation and measurement software, including auralization (listening to simulated acoustics).
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This is perhaps the most powerful alternative to ODEON. It is a graphical interface that allows you to model 3D scenes and run acoustic simulations using different "engines" (like SPPS for sound particle physics).