PagerDuty - Cloud based monitoring service
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
VictorOps - We make on-call suck less & help teams to solve problems faster.
Notion - All-in-one workspace. One tool for your whole team. Write, plan, and get organized.
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.
Slack - A messaging app for teams who see through the Earth!