I’ve been looking for a simple and free program to mass restart computers by a simple copy/paste and finally found it: RemoteRebootX! I was actually using a Powershell script where I could copy/paste in a list of computers and the script would hang about 1/3rd of the way into the list. Admin Assistant works good for restarting computers, however, you have to create a group first, then import the computers into the group, then you can restart them from the action menu. I just wanted to copy/paste my list and go.
I just typed my request into Grok AI about the best freeware restart tool and viola, it did the research and recommended RemoteRebootX. This tool also does other nifty stuff such as get uptime, free space, wake on lan, remote control over RDP, and it will allow you to create scheduled tasks on the remote computers.
Soli Deo Gloria