Meshlab is a free for non-commercial use mesh editor, available for Windows, OS, and Linux. Meshlab provides a range of tools and techniques to further refine and fix meshes. These meshes can be exported to other software packages. Since Meshlab is not a VR tool specifically, yet useful to know about in case of VR content creation, I have not put together tutorials on this software; Meshlab is typically one of those software packages that you learn best by exploration. Hint: save a lot!