Enterprise Development Tools For Linux?

jesus_on_dope asks: "Are there any enterprise development tools available for Linux, i.e. something like database-modeling tools like ERWin or Powerdesigner, CASE-tools like Rational? Or are any projects under way on tools like these mentioned Windows tools? I'd like to make a change towards Linux as development platform, and not only use it as database-server ..." This is one area where Linux needs improvement. What's the current status on such things, if they exist at all?