The 2.10.0 version of XNA Model Viewer is provided as a free download on our website. XNA Model Viewer is included in Games. The most popular versions among the program users are 2.8, 2.1 and 1.0. Commonly, this program's installer has the following filename: XNA Model Viewer.exe. The actual developer of the free program is Lucid Vision Games.
From the developer:
The XNA Model Viewer allows you to load FBX files and view them. You can examine the bones and meshes and see the complete hierarchy. It allows you to test that models will work in XNA, determine the effect of modifying bone transforms, and view animation clips.
You may want to check out more software, such as Yakindu Model Viewer, Model Viewer or Solibri Model Viewer, which might be similar to XNA Model Viewer.