Comment by CRConrad

> They disappeared because they weren't able to compete with the commoditization of Java IDE's (Eclipse) and Microsoft's integrated sales channel on Windows (Visual Studio).

That, plus their weird and (IMO obviously even at the time) misguided pivot to emphasise SLM systems over dev tools. Well, it may be the same thing: seems likely this pivot was what led to them not being able to keep up with Microsoft on dev tools.