Check out the OpenPeripherals mod. It turns inventories into peripherals. You could use wired cabling to attach all of your barrels to the computer as peripherals and then some tables to store the data, and then display it however you like.
Just note that the mod is undergoing a bit of a rewrite, as I understand, and some of the documentation on the website is out of date. (e.g. "chest.getSizeInventory()" is actually now "chest.getInventorySize()".) Use getMethods(), it'll save you headaches.
Check out the OpenPeripherals mod. It turns inventories into peripherals. You could use wired cabling to attach all of your barrels to the computer as peripherals and then some tables to store the data, and then display it however you like.
Just note that the mod is undergoing a bit of a rewrite, as I understand, and some of the documentation on the website is out of date. (e.g. "chest.getSizeInventory()" is actually now "chest.getInventorySize()".) Use getMethods(), it'll save you headaches.