Tesla is obviously the most famous, but AFAIK many other brands now offer self-driving that is considered to be at Level 3, or close enough.
Zoox is just starting to offer L4 rides in Las Vegas & Sf. It's trailing Waymo by a few years, but has good design & core tech.
Tesla is taking a very different & controversial approach, and is generally viewed, by most people with knowledge of the industry (armchair experts on X aside), as far behind in core technology for L4 cars, but as having the best driver assist system. I think they're in for a rude awakening when they try to launch 'real' self-driving cars in Austin, but time will tell.
Overall, do yourself a favor, and check out Waymo videos on youtube.