Building a Parrot Compiler
Neither rewriting the system nor ditching it for someone else’s software was an appealing option, especially given that the reason to do so was essentially an internal issue and mostly invisible to the users. We decided instead to do the sensible thing—we rewrote DecisionPlus. Or, rather, we wrote a compiler that understood DecisionPlus and, rather than targeting the DecisionPlus virtual machine and runtime that was causing us problems, we targeted a newer and less restrictive system.
And as a bonus the system works just fine under OS X -- I've a complete development system, database and all, on my iBook, suitable for hacking on while at my local coffee shop. :)