Here is the current browser based version:
http://caltech.wormbase.org/virtualworm/
Human version (much cooler): http://www.zygotebody.com/
Cow version: http://open-3d-viewer.googlecode.com/svn/trunk/web/index.htm...
Source code for the viewer for all of these: https://code.google.com/p/open-3d-viewer/
Note: you're going to want to use hardware acceleration for these, otherwise they'll be very slow.