It lets you manage jails, jail offline players, and sentence time will be over when prisoners have been online for the required time, or they can be offline too (settable in config file).

It also has integration with Essentials (if loaded into the server), changing the Jailed tag when necessary.
And it has optional integration with Vault to change the player's group when jailed/unjailed.

Commands, permissions and configurations

If you wish to reach out to me and get support, you can do so on my discord server.