Apollo (from Baidu) - Open Source platform to develop autonomous driving systems
Cruise - Holy shit. Self-driving cars.
Comma.ai - Open source self-driving car platform
EDIT Self-Driving Car - The world's first open & modular self-driving car
AWS DeepRacer - A 1/18th scale race car to learn machine learning 🚗
OSVehicle - The 1st open source mass market car platform (with Renault)