Sylve, proxmox, and TrueNAS are all tools focused on: virtualization, containers, storage, and clusters. I've not used webmin, but it looks like a broader focus. Something like a kitchen sink of administering anything Unix-like via a web browser.
I wouldn't be surprised, glancing at webmin's site and docs, if it can do most/all of what more focused management tools like Sylve or proxmox can, but it seems to have so many other dials and knobs that IDK if I'd reach for webmin unless I were already familiar with it.
So Sylve is sort of the opposite of webmin in certain ways: highly focused, very new, built on a specific OS. It just looks interesting to me because FreeBSD has been great to work with already at my network gateway (running opnsense for firewall and routing), and I like the idea it replacing TrueNAS on a box I already own and use both for storage and running various self-hosted services (e.g. Jellyfin, Vaultwarden, Home Assistant, and the like) in containers and/or VMs as appropriate.
I wouldn't be surprised, glancing at webmin's site and docs, if it can do most/all of what more focused management tools like Sylve or proxmox can, but it seems to have so many other dials and knobs that IDK if I'd reach for webmin unless I were already familiar with it.
So Sylve is sort of the opposite of webmin in certain ways: highly focused, very new, built on a specific OS. It just looks interesting to me because FreeBSD has been great to work with already at my network gateway (running opnsense for firewall and routing), and I like the idea it replacing TrueNAS on a box I already own and use both for storage and running various self-hosted services (e.g. Jellyfin, Vaultwarden, Home Assistant, and the like) in containers and/or VMs as appropriate.