Game Developer software 3d Rad

3D Rad
  - This software is completely free for commercial and non-commercial use. Please click the Download button to to initiate the download (45 Mb). When prompted, select 'Run' to proceed with the installation. Note that you may also have to authorize the installation, depending on your Windows security settings. A zipped version of the same file is also available here. There is also an older version of 3D Rad which uses ODE instead of NVidia PhysX for physics simulation: exe, zip.