Opis Mod 1.7.10, 1.7.2 is a must-have for any server admin, as this mod will allow you to spot the chunks which are eating up your TPS, the worse tile entities or simply jump anywhere you want.
You will have to download both MobiusCore and Opis. Those are available in the download section. Copy both in your mods directory as usual, on the client and the server. You are not required to distribute the client side to your users, unless you want them to have access to the loaded chunk map.
If you are using MapWriter already, REMOVE IT. I’m providing my own modified version along with Opis. If you have both installed at the same time, you will get an error when you start the game. Don’t complain, you have been warned.