Ask Slashdot: Pure Object Databases in Linux?

ramkal asks: "I would like to know if there are any good "pure" object databases (free or commerical) for Linux. No I don't have Oracle 8 (or Informix IDS) in mind. I would hear from those who have succesfully implemented ODs in a decent project (100k + lines of c++ code). True, ODs are no longer as hot as they used to be a couple of years ago but they have their own advantages as I have seen in a financial industry setting."