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
PagerDuty - Cloud based monitoring service
LiveChat - LiveChat - premium live chat software. Approach customers directly on the website, make connections and drive more sales using LiveChat.
VictorOps - We make on-call suck less & help teams to solve problems faster.
Crisp Chat - Multi-channel customer support software
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.