Comma.ai, the tech startup that recently pulled the plug on its device to give cars limited self-driving capabilities after being reprimanded by US regulators, has opened up its software secrets to the masses. On Wednesday, Comma.ai announced on its website that it had open sourced the software code and robotics research platform for the driver-assistance system the company had planned to start selling at the end of the year, before the National Highway Traffic Safety Administration (NHTSA) compelled it to change course.