

mRemoteNG has always been my go-to. Supports multiple remote protocols, though I’ve typically only used it for SSH and RDP. Tabbed interface, save a list of endpoints with the connections configs, etc. SSH just runs an instance of putty within the program, so it’s pretty straightforward.


(I know this post is a month old, but I just came across it.)
We deal with this by not dealing with it, so to speak. We keep the on-prem AD account disabled and just move it to a synced OU called “Terminated”, then strip all group memberships/permissions from it. Once we’ve held onto the shared mailbox for the required length of time, we then delete both the on-prem AD account and the shared mailbox.