BiggerCake - The data tool that Kickstarter deserves
Inbox When Ready - Protect your focus... hide your Gmail inbox by default
Campaign Monitor Insights - Actionable analytics for email marketing and automation
Snailbox - Schedule your email at specific times and recover the time you're losing to your inbox.
Snov.io - More leads. More sales. More revenue.
PixelBlock - Block email open tracking inside of Gmail