vim
Vim is a text editor originally released by Bram Moolenaar in 1991 for the Amiga computer (based on an earlier editor, Stevie, for the Atari ST, created by Tim Thompson, Tony Andrews and G.R. (Fred) Walter). The name "Vim" is an acronym for "Vi IMproved"[2] because Vim is an extended version of the vi editor, with many additional features designed to be helpful in editing program source code (originally, the acronym stood for "Vi IMitation", but that was quickly changed once Vim's feature set surpassed that of vi).[3]
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