MacVim

MacVim supports multiple windows with tabbed editing and a host of other features such as bindings to standard OS X keyboard shortcuts (command-Z, command-V, command-A, command-G, etc.), transparent backgrounds, full-screen mode, multibyte editing with OS X input methods and automatic font substitution, ODB editor support. Most importantly, MacVim brings you the full power of Vim 7.3 to Mac OS X.