Sysinternals

On Sysinternals you find a collection of advanced Windows utilities you can use for free, plus a blog that delves deep into the internal workings of Windows.

Wikiwyg

Demo of Wikiwyg, a Javascript library that offers the user multiple ways to edit/view a piece of content. Here you can edit the content of the page you’re viewing. Just doubleclick on a piece of text and it changes into a little editor.