I've looked around and not seen any solutions to this problem
I work for a company as an automation engineer keeping a network behind a DMZ. I have an AD, switches, etc. We have local passwords for our switches, special accounts for vendor supplied software, the AD admin (which is required to be logged in for some vendor software), etc. In the past month, we lost the other 3 people in the group, leaving me as the only one who knows some of these username/password combinations, and I now need to change them. It occurs to me that I will be the only one who knows some of this and is something was to happen to me, there would be no way to get someone else in without a full reset.
What I am looking for is a way to store the credentials so that I can set up a couple of people with accounts that could view the combinations in plain text using their own credentials. Ideally something stored offline which I could host on the off-line system. Would have the people I am training have access as well as a couple of backups (probably the plant manager and head of security) in case of emergency. Has anyone done something like this?