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.
Zabbix - Track, record, alert and visualize performance and availability of IT resources
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!
Prometheus - An open-source systems monitoring and alerting toolkit.