Let's Encrypt Alternatives (other ACME services)

I was working with a client today who is concerned about using Let’s Encrypt for a particular project as it may represent a single point of failure.

Ignoring the fact that a single working and reliable solution is better than no solution, it does beg the question: What are the alternatives?

I seem to have found two, and I’m interested to know: Is there a list of companies using Boulder? Or that otherwise offer ACME service?

P.S. I saw that this question was asked a few years ago, but there seemed to be very few responses and it is closed to new comments.

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Digicert/CertCentral, Sectigo/Comodo, GlobalSign, ZeroSSL (now its own CA) all have ACME services.

Don’t know if any of them besides Let’s Encrypt runs Boulder.


Wikipedia has a list: https://en.wikipedia.org/wiki/Automated_Certificate_Management_Environment#CAs_&_PKIs_that_offer_ACME_certificates

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