Snailbox - Schedule your email at specific times and recover the time you're losing to your inbox.
Ecommerce Senders - Live email marketing insights for the top 100 Shopify stores
Inbox When Ready - Protect your focus... hide your Gmail inbox by default
BiggerCake - The data tool that Kickstarter deserves
Clean Email - Clean Email is an online service that empowers you to take control of your mailbox.
Email Insights - Email Insights - Analytics for Marketers