GitHub for CAD. With 3D printing poised to explode shortly, I am predicting a need for versioning of CAD models (along with FEM analyses). Current solutions (PLM/PDM) are very expensive and usually need to be customized. This is a business that is runs into billions of USD per annum and is ripe for disruption.
If anyone is interested, please get in touch at dj@pgxplorer.com.