Zeplin - Collaboration app for UI designers & frontend developers
Outlook4Gmail - Outlook4Gmail provides easy synchronization of your Outlook and Google accounts
Mightytext - Send & Receive SMS Text Messages from your computer. Sync'd with your Android #
Boomerang for Outlook - Boomerang for Outlook offers email productivity tools to track, schedule and send mails at the right time.
ActiveWords - Auto correct on steroids
BlueMail - BlueMail is an email management app for Android, iOS, and Windows.