Almost! Or rather: there is almost a working ImageJ update site.
We added a page about voxelization to the ImageJ wiki awhile ago. However, those instructions are now outdated. The “ThreeDViewer” is now known as SciView. Much time and effort is being expended by @kephale and @skalarproduktraum and myself to get it to a usable state. One of its features is voxelization of meshes.
We are in the middle of a hackathon this week madly working on this stuff. So please stay tuned; hopefully we will have something for you to try soon.