MailChimp - MailChimp is the best way to design, send, and share email newsletters.
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
SendOut - Affordable email marketing for bloggers and influencers
Carrd - Simple, responsive one-page site creator.
rasa.io - Get more from your email list.
Avochato - Text messaging for your business.