Get rid of those web sites with slideshows that waste your time getting through. This tool converts those annoying lists with one slide per page into a one-page list.
Webrecorder is both a tool to create high-fidelity, interactive web archives of any web site you browse and a platform to make those recordings accessible.
Superpowers is an HTML5 development environment for making 2D and 3D games. It can be extended with plugins and lets you collaborate in real-time.