[server] What is the best free way to manage vm server?

I have a ubuntu server with a bunch of ubuntu vm's on it.
I need a easy free way to manage them, as sometimes they don't want to shutdown and I need to force it.
Also to make and delete them and change their hardware.

I currently got windows 10 and it was the same when I had windows 7.
I normally use mtputty as it can kinda sometimes save passwords and its got its own little window manager for multiple ssh sessions.
Then I have x2Go and putty.
Putty has to have some x11 forwarding then x2go is needed for some reason that I can't remember and then you have to go back to the putty and type virt-manager.
Basically I hate juggling 3 programs on my monitors like that and want a way simpler solution.

I've got some spare computers laying around that I could even install ubuntu or some linux on.. altho it would have to have a light gui.

Thanks,
Higgins909