tawk.to - tawk.to is a free live chat app that lets you monitor and chat with visitors on your website or from a free customizable page
MailChimp - MailChimp is the best way to design, send, and share email newsletters.
ChatWoot - Open-source omnichannel customer engagement platform
Elastic Email - Elastic Email is an all-in-one email delivery platform for both marketing and transactional email.
HelpCrunch - HelpCrunch Live Chat: Turn prospects into customers, drive sales and improve retention with a rich toolbox combining modern live chat, in-app messenger, email marketing, CRM and marketing automation.
Zoho Campaigns - Smart email marketing software that helps you reach your target audiences, engage in a personalized way, and grow your brand presence.