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https://www.marinetraffic.com has most AIS transponders, I use it to track friends on commercial and private vessels.

https://aprs.fi also shows AIS (as well as ham radio operators which is its primary function)

Thanks for the recommendation, looks interesting. I've used Vessel Finder due to something being a nuisance with Marine Traffic.

https://aisvesseltracker.com/ is a good one too. Shows a LOT more, including cruise ships and pleasure craft.

Doesn't track all container ships. I'm looking out my office window at Eliot Bay (Seattle), I see two container ships not on the map.

It's also a bit limited. The gold standard is still kpler.