Baydin makes Boomerang, a plugin for Gmail, Google Apps, and Microsoft Outlook that lets you schedule sending emails, track responses, and remove incoming messages from your inbox, having them return when you need them. It's available now boomeranggmail.com, has been downloaded over 3 million times, and has moved Baydin well into profitability.
We also make the best email client on Android, also named Boomerang, and also supporting Gmail, Google Apps, and Microsoft Exchange.
Boomerang Calendar (boomerangcalendar.com), a smart calendar assistant that lets you schedule meetings in a single email, and Inbox Pause (inboxpause.com), a pause button for your email, round out our offerings.