OpenProj. A quick trip to the OpenProj SourceForge page later,
and I realized another big Microsoft app had an open source replacement: MS Project. it’s written in Java, and there is no Mac-specific distribution, so I grabbed the
and just double-clicked the .jar file, which worked fine.
Apparently it can read and write MS Project files too. I didn’t do much more than create a document and save it, but I’m hoping this will be a useful tool for free software projects all over.