Dataphor is Open Source!
Bad news! It's written in C#. C# is lovely, but this will likely limit its adoption in the non-Windows world. I'm curious to know if it will compile and run under Mono. More important, how would we write a Perl interface for it? True relational databases seem to eliminate the object-relational issues which ORMs traditionally have. It would be nice to see how well it translates in practice.