NetBox - NetBox is an open source web application designed to help manage and document computer networks. NetBox was developed specifically to address the needs of network and infrastructure engineers.
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.
Snipe-IT - Managing assets with a Google doc or a shared Excel spreadsheet is more common than you think.
Notion - All-in-one workspace. One tool for your whole team. Write, plan, and get organized.
Zabbix - Track, record, alert and visualize performance and availability of IT resources
Slack - A messaging app for teams who see through the Earth!