I think Slime for Emacs was the first to think of it, a looong time ago (at least it was the first place I saw the idea in action). Edit to clarify -- Slime wa

I think Slime for Emacs was the first to think of it, a looong time ago (at least it was the first place I saw the idea in action). Edit to clarify -- Slime was never meant for general use across many languages. But Slime had the "smarts" in a separate process and communicated with the editor via the network.