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.
ChatWhale - Gamify your customer communication and loyalty rewards
Nova Inbox - Personalize emails in seconds, right from your inbox
Promoter - The Most Effective Way To Engage And Learn From Customers
Mailblast - Email marketing on a budget using Amazon SES
LaunchKit - Open Source - A popular suite of developer tools, now 100% open source.