The ‹daofind+› project has released enhancements, including a new Macintosh version, to MEX (Midosa Editor for XML-Standards), a finding aid tool set that supports EAD, EAC, and METS.
Here's an excerpt from an announcement of an upcoming meeting about MEX:
The MEX tool set (MidosaEditor for XML standards) is available at SourceForge in English and German for Windows and MAC. It was developed by the two projects ‹daofind› and ‹daofind+› with support from the Andrew W. Mellon Foundation, New York. MEX can be used for capturing and editing EAD, EAC and METS files and for producing complete integrated HTML presentations of online finding aids with digitised records in one step.