Campaign Monitor - Email marketing software built for designers and their clients to run successful email campaigns.
Zabbix - Track, record, alert and visualize performance and availability of IT resources
MailPlus - MailPlus is a Dutch-based email marketing solution provider.
Datadog - See metrics from all of your apps, tools & services in one place with Datadog's cloud monitoring as a service solution. Try it for free.
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.
Prometheus - An open-source systems monitoring and alerting toolkit.