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?
Personal experience:
Argo workflows and Argocd (vs. something like Harness) - Requires a handful of customizations to get it parity, but it's really useful out-of-the-box I think. Good ol' Jenkins works too, I suppose.
Soon, OpenTofu - unfortunately Hashicorp is going IPO which means bad news. OpenTofu is the fork of terraform.
Podman - Docker alternative. It's really close, especially with Podman Desktop. I had a few issues that I ran into, but there are probably workarounds.
Vscode / codium - yeah it's Microsoft, and has tracking. But it's popular for a reason.