Both seem to be maintained reasonably recently.

Although, both seem to be from Daisy...
CivicActions · Dec 14, 2023 · 134326f · 134326f
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diff --git a/_guide/tools.md b/_guide/tools.md
@@ -187,6 +187,7 @@ Color blindness simulator for Windows, Mac, and Linux.
 ## EPUB3 {#epub}
 
 * [EPUBCheck](https://github.com/w3c/epubcheck)
+* [Ace, by DAISY](https://github.com/daisy/ace)
 
 ## PDFs {#pdfs}