You can download it (and get more info) here

Yes it is free (including source code). It is covered by a "charityware" license, similar to KiXtart's "careware". And the maintainer Bram Moolenaar is Dutch I believe. Spooky, eh?

It has a powerfull scripting language and a generic WIMP/GUI interface.

It's probably most useful to people who already know VI and it's keystroke / regular expression / colon prompt commands. Someone who just wants a syntax highlighting editor on Windows is probably better off with something simpler.

It has some great features that I'm only just discovering after years of using it. I recently discovered "folds", which allow you to collapse sections of code to a single line. I now "fold" functions and variable declaration areas in my code, and as the folding can be nested I fold large and complex SELECTs within the function folds.

And of course it supports "convert to HTML" for any programming language syntax [Wink]