Templates by Email Monster - Hundreds of free, responsive email templates. Pick and edit.
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.
MJML - The open source framework for responsive emails
AppDynamics - Get real-time insight from your apps using Application Performance Management—how they’re being used, how they’re performing, where they need help.
Stripo - Stripo is an all-in-one email design platform. We enable our clients to build emails of any complexity, including interactive AMP emails, really fast and easy.
Zabbix - Track, record, alert and visualize performance and availability of IT resources