I came across a mod the other day that said it allowed you to view a live view of someone elses inventory however I can no longer find it. Anyone know what I am talking about and can help me? Or am I going crazy?
If you already have a plugin such as CommandBook for essential commands, you could use a plugin like OpenInv. I always find specific plugins to have more useful features and generally work better than a general plugin like Essentials. I think it also allows you to view inventories of users who are offline, however I'm not 100% sure on that. This would save you installing a whole new plugin.