Vim

            
            Vim is a highly configurable text editor built to make creating and changing any kind of text very efficient. 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