I really like Syncthing, Nextcloud, Forgejo and Mailcow to collaborate with colleagues.
Kimai allows me to track hours and get paid.
Barrier allows me to use several computers at once.
Xen Orchestra is pretty much on par with VMWare stuff and way cheaper.
What other awesome software does allow you to work more efficiently in a business context and stays out of your way?
TrueNAS Scale. It’s based on Debian instead of FreeBSD (like TrueNAS Core) and has KVM virtualization and k3s containerized app support built in, in addition to being a NAS operating system.