Going way back, the easy answer for me is the Paradox desktop database from Borland. I used it in DOS in 1990; Windows kind of killed it. It was amazingly easy

Going way back, the easy answer for me is the Paradox desktop database from Borland. I used it in DOS in 1990; Windows kind of killed it. It was amazingly easy to build apps in it. https://en.wikipedia.org/wiki/Paradox_%28database%29 https://en.wikipedia.org/wiki/Paradox_%28database%29 Although reading that page I see that it still exists!? So maybe it doesn't qualify for this question. [Edit: I see the dBase/FoxPro family mentioned down below. Same idea, roughly. Also great.]