Utilities is a category of the reward store containing services which, unlike the rest of the store, have the unique distinction of being free. Once applied they take effect and can be used an unlimited number of times.
Send yourself to spawn. This can be useful if you're in immediate danger. In such a situation it's best to disconnect immediately, jail yourself, wait a few minutes for the jail to take effect, and then rejoin. Disconnecting is optional but has the benefit of preventing your death before you're jailed.
Releases you from jail.
Deletes your inventory. Handy if a held item is causing you to crash and you don't care about the other items.
It's possible other utilities will also be included here such as those which are useful for specific servers only. This list is subject to change.