Bookings allows you to provide online booking services for your site.
GD Pages Navigator allows you to change the way navigation works for pages and other hierarchical post type with different navigation methods.
Simple Facebook Connect is a framework and series of sub-systems that let you add any sort of Facebook functionality you like to a WordPress blog.
Tallyopia Analytics provides analytics that you can embed into your site using shortcodes or view in your admin dashboard.
yolink Search is a drop-in replacement for WordPress search that provides relevant results.