VIM: the ubiquitous text editor

Vim is a highly configurable text editor for efficiently creating and changing any kind of text. It is included as "vi" with most UNIX systems and with Apple OS X.

Vim is rock stable and is continuously being developed to become even better. Among its features are:
persistent, multi-level undo tree
extensive plugin system
support for hundreds of programming languages and file formats
powerful search and replace
integrates with many tools