Touting some impressive specifications, (15 stops of Dynamic Range, Super 35mm Sensor) the Apertus Project is aiming to create a modular camera system that operates on an (free) open source software. This opens up opportunities for coders to develop and modify the system to meet their needs, and share with a community. Think of Magic Lantern for DSLRs, but not having roadblocks like those in the Canon Firmwares.
• Cinema DNG Recording
• Super 35mm Sensor
• 4K Resolution
• Global Shutter
• 15 Stops of Dynamic Randge
• Projected price below $10,000
It's great to see DIY'ers starting these kinds of projects and making them so community oriented, for more info check out Apterus.