While there are some other bridging solutions available, ROS2 For Unity is meant for users who care about performance and high-speed simulation , especially with large data throughputs which are usual in automotive simulations.
It runs on Ubuntu 20.04 and Windows 10 and we tested it with Unity 2021.1.7f1. Both Foxy and Galactic are supported. You can start with one of our prepared releases, which can be easily imported as a Unity Asset.
For Windows 10, you have all the dependencies included so it will work on a machine without ros2 installation (e.g. in a distributed simulation - stack architecture).