ACME
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ACME is the Adactio Content Management Engine, a privately developed CMS by 
Jeremy Keith written in PHP with MySQL for storage.
IndieWeb Examples
Jeremy Keith
Jeremy Keith uses ACME on his personal site https://adactio.com/ (using what he makes)
He is likely also using it on additional sites he maintains:
Jessica Spengler
Jessica Spengler uses ACME on her personal site https://wordridden.com/
Naming
The name "Adactio Content Management Engine" and its backronym "ACME" were invented by the community to label Jeremy’s otherwise unnamed personal site CMS, which he has used for other sites as well, and has added a tremendous number of IndieWeb features to, developed incrementally for over a decade.