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There is also SimpleLogin.

AA and SL do look like the two more solid options compared to anything else I've seen so far.

SimpleLogin was bought by Proton[0], so if you have a Proton Unlimited, Business or Visionary plan, you'll get SimpleLogin premium for free.

[0]: https://proton.me/news/proton-and-simplelogin-join-forces

SimpleLogin was recently acquired by Proton [1]. I'm hoping nothing changes, but you never know.

[1] https://simplelogin.io/blog/simplelogin-join-proton/

Coincidentally we just this week added tracker removal to https://relay.firefox.com/ (needs to be explicitly enabled due to the risk of breakage).

I should note though, that while it is open source (and freemium), it's reliant on quite some infra that makes it pretty much impossible to self-host, if that's something you're looking to do.

I'm working on a similar project: https://shroud.email/

It doesn't yet have all the same features as SimpleLogin/AnonAddy, but unlike them it does remove email trackers.