>Is there a comparison somewhere. I'm not only interested in the database engine, but tools and UI features as well.
It seems to me that the last three in the list are used MAINLY as a database engine, and are MEANT to be used in conjunction with other tools for the client side.
For example, Oracle has its own developer tools, but I believe you can just as readily use Visual FoxPro, Dotnet, Java, etc., against an Oracle database, or use the Oracle tools against other databases.
With Visual FoxPro, we are accustomed to do many things with one single tool; outside of the FoxPro world, this doesn't seem to be the standard paradigm.
Difference in opinions hath cost many millions of lives: for instance, whether flesh be bread, or bread be flesh; whether whistling be a vice or a virtue; whether it be better to kiss a post, or throw it into the fire... (from Gulliver's Travels)