SendX.io - SendX (https://sendx.io) provides remarketing and retargeting tools for web businesses. You can use popups, landing pages, email, web push notification, automation workflows and FB / Google retargeting to drive more revenue.
Topicbox - Put team emails into one centralized, searchable place
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InboxSDK - First usable API to write Gmail Apps for 1B active users
Mailblast - Email marketing on a budget using Amazon SES
Front - The platform for exceptional customer service at scale.