The guys at SmartReach.io have created a pretty cool plugin for LinkedIn and Gmail. Find contact details while browsing LinkedIn, or directly within gmail as you are composing a new message.
We think the Gmail email finding feature is pretty cool, and definitely unique. If you use Gmail a lot, and outreach to many people on a case-by-case basis, we'd recommend it!
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.