Nvi is an implementation of the Ex/Vi text editor originally distributed as part of the Fourth Berkeley Software Distribution (4BSD).

A getting started guide for Vi users.

The homepage of a popular Vi clone available for many operating systems.

Tutorial based on the graphical cheat sheet created for people learning Vi or Vim.

An excellent paper written by the author of Vi, Bill Joy

Free Notepad replacement highly compatible with the Vi editor issued under the GPL license.

BSD ex/vi 3.7 ported to modern Unix systems. The original Vi source code, with a few necessary modernizations.

Advanced tutorial for the Vi/Ex editor written by Walter A. Zintz first published in Unix World magazine.

An expanded version of Maarten Litmaath's Vi Reference. More Ex commands and more examples.

The Bvi editor is a display-oriented editor for binary files, based on the Vi text editor.