Jetpack can supercharge your self-hosted site with a suite of the most powerful WordPress.com features. Popular features include Custom CSS, Single Sign On, and WordPress.com Stats.
You can easily create slideshows with Carousel, embed content with Shortcode Embeds, add custom widget placement with Widget Visibility, automatically share new posts with Publicize, and add a Contact Form anywhere on your site. The list goes on and on, and you get it all at no cost.
Learn more at jetpack.me or on Twitter @jetpack