It's really not hard to just search "openpilot" and click the first link. There's also a link at the top of the comma.ai website that links to the same page.

https://comma.ai/openpilot

openpilot is an open source advanced driver assistance system that works on 300+ car models of Toyota, Hyundai, Honda, and many other brands.

    Automated Lane Centering
    Adaptive Cruise Control
    Lane Change Assist
    Driver Monitoring (no wheel nags)
    Can drive for hours without intervention
    Open source and developed on GitHub