Avochato - Text messaging for your business.
MailChimp - MailChimp is the best way to design, send, and share email newsletters.
Postscript - Like Mailchimp for SMS
HubSpot - Grow Better With HubSpot: Software that's powerful, not overpowering. Seamlessly connect your data, teams, and customers on one CRM platform that grows with your business.
GetChat.App - Add WhatsApp chat to your website for free
EZ Texting - EZ Texting provides SMS marketing solutions to businesses of all sizes.