The behave3d library is an open-source project with a MIT License.
The project is hosted at GitHub - https://github.com/SNNikolov/behave3d,
and is also available as an NPM package - https://www.npmjs.com/package/behave3d
Feel free to download, share, modify as you like or contribute to the development.
You can quickly download the latest version from here:v0.8.3
(The package contains both the original and built+minified files)
Or get the npm package:
npm install behave3d