MailChimp - MailChimp is the best way to design, send, and share email newsletters.
MySQL - The world's most popular open source database
Brevo - Innovative online Email Marketing solution to manage your contacts, create & send your newsletters and track your results. More than 80 000 clients. Best prices and attractive features.
Datahike - A durable datalog database adaptable for distribution.
Campaign Monitor - Email marketing software built for designers and their clients to run successful email campaigns.
MarkLogic Server - MarkLogic Server is a multi-model database that has both NoSQL and trusted enterprise data management capabilities.