VATK: library for creating a version of the site for visually impaired people.
Notify-send for Windows: command line utility, that displays pop-up desktop notifications. Here you can download the analogue of this utility for Windows.
HTML Shortcuts: service for creating a shortcut to a web page as an HTML file. HTML shortcuts are a convenient alternative to browser bookmarks and Internet Explorer shortcuts.
User Agent: displays the User Agent string and other browser information. This information is often needed by technical support services. Sometimes it's easier to give a link, than to explain, where you can see the browser version or screen resolution.