Glue Loyalty - Glue is a fully automated-hands-free loyalty platfrom for small and local businesses who wants to grow more repeat business.
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Cakemail - Email marketing and transactional emails that deliver. Try it for FREE!
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.