Cold Turkey - Cold Turkey is a free productivity program that you can use to temporarily block distractions so that you can get your work done!
NeverBounce - Real-time email verification and cleaning to ensure emails never bounce.
Freedom.to - Freedom is a productivity hack that lets you block apps, websites or the entire Internet on iPhones, iPads, Windows and Mac computers.
ZeroBounce - Removes invalid emails from your list to prevent email bounces from ruining your deliverability.
Stay Focused - More suitable with Google Chrome, this service enables you ensure you do not waste precious time on updating Facebook status or chatting with people.
Email List Verify - The Fastest Way to Improve Email List Deliverability and ROI