Kingmailer - Kingmailer helps you send, receive and route/forward emails.
Clearbit - Clearbit provides Business Intelligence APIs
Flexmail Solution - Professional email marketing with powerful and easy-to-use features
DataXu - Marketing analytics for brands and agencies.
Dragon Responsive Email Designer - Dragon Email Designer provides an intuitive drag and drop newsletter design tool.
V12 Data - V12 Data offers rich data sets with verified addresses and emails for personalized marketing campaigns.