Years in the making, Apertus has released 25 beta developer kits for AXIOM–their open source digital cinema camera. This isn’t your point-and-shoot digital camera. The original proof of concept from 2013 had a Zynq processor (a Zedboard), a super 35 4K image sensor, and a Nikon F-Mount.
The device today is modular with several options. For example, there is an HDMI output module, but DisplayPort, 4K HDMI, and USB 3.0 options are in development. You can see several sample videos taken with the device, below.