Are you specifically asking for a gear box that attaches to the output shaft of a versaplanetary, or are you asking for a simple way to change the motion to be perpendicular to the rotation of the output shaft?
If you're asking for the former, you have been given some solutions by the posters above. If you're asking for the latter, you can simply put a bevel gear directly on the output shaft of the versaplanetary, and have the second bevel gear on the shaft you need to drive. The way you form structure around this is entirely dependent on your design and manufacturing capabilities. I would appreciate a description or sketch of what you wish to do so we can better help.
Here is an example from our 2015 practice bot intake for the latter option:
