Keyper is an SSH Public Key Manager. It standardizes and centralizes the storage of SSH public keys for all Linux users in your organization. Saving significant time and effort it takes to manage SSH public keys on each Linux Server. Keyper is a container occupying less than 100MB. It is launched either using Docker or Podman. You can be up and running within minutes instead of days.
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Pros
Pro Low price of entry
To quote their pricing page for commercial use: "Free for up to 20 servers and 5 users. $1/month for additional servers and users." All though a bit murky what does "additional servers and users" imply (does it mean extra 20 servers covered or 2000 servers? 5 more users for 1$/month or 500 for 5000$/month?)
Cons
Con Very expensive
Pricing os based on both users and servers, so you can't really control your bill very well.