Poor Boy’s Oracle - Open Source Oracle (and free)

"In the midst of my metamorphosis into a web-standards adherent, I
suddenly got bit (again) by the database bug. This is to blame, the
first really decent book written (in English) on the Firebird database
platform. In my efforts to “fill out the toolbox,” I’ve been searching
for a decent database platform that won’t kill my meager (read:
non-existent) budget." ....

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