The best alternatives to Optimus Ride are Open Source Vehicle, comma.ai, and Scootbee. If these 3 options don't work for you, we've listed a few more alternatives below.
Scootbee is building a fleet of autonomous, self-driving scooters available in an instant. Plug in your location, and a scooter will scoot its way over to you. Take it wherever you need to go, and then hop off - it'll scoot away to its next guest.
Grin is a network of shared electric scooters in Latin America. Grin brings the rental scooter solution to a region that is filled with densely populated cities that have heavy traffic problems.