OnShape is pretty interesting for sure. In fact my company is also trying a new product ourselves to similarly provide services for Designers and Engineers.
We will start hosting a CLOUD based Virtual Engineering tool
http://vrify.esi-group.com/
It will be an browser app initially but perhaps also a mobile app that would enable Virtual Reality and interactive simulation of assembly, packaging, and systems integration. Things like kinematic chains, wiring and hose behavior during motion, etc.
I'm looking for people to participate in early beta testing who would like to try it for free and provide meaningful feedback.