Tool Repair Plugin

http://forums.bukkit.org/threads/mech-autorepair-v1-11-1-repair-your-tools-and-armour-860.565/

we could repair our tools with the cost of money with this!

There is also a mod where u can use a certain type of block as an anvil and repair using a minera. For example a diamond pick u would use one diamond to repair using an anvil