SpamTitan - Comprehensive Email Protection. 99.99% Spam Detection. Blocks phishing, viruses, malware and other email threats.
Outlook4Gmail - Outlook4Gmail provides easy synchronization of your Outlook and Google accounts
Sanebox - SaneBox is a cloud-based service that allows users to filter and manage their emails.
Boomerang for Outlook - Boomerang for Outlook offers email productivity tools to track, schedule and send mails at the right time.
MailCleaner - Cloud & on-premise anti spam software for businesses
BlueMail - BlueMail is an email management app for Android, iOS, and Windows.