Nymeria's browser extension enables you to find personal and professional email leads with the click of a button.
It has a nice add-on feature which brings up emails when browsing within LinkedIn. Very handy for recruiters!
Skrapp is a SaaS Chrome Extension for B2B prospecting on professional social networks.
Their export feature is great and the simple UI makes it very easy for beginners who are focused on gleaning bulk data from LinkedIn.