It's from the Mercurial repository of VIM.Vim is a highly configurable text editor built to enable efficient text editing. It is an improved version of the vi editor distributed with most UNIX systems. Vim is distributed free as charityware.  The main Vim website is http://www.vim.org/  You can find Vim tips on http://vim.wikia.com/wiki/Vim_Tips_Wiki Besides the GNU GPL Vim is distributed under another license. See ":help license" in Vim for details.