Hecatonchyr's Tutorial

When you want to write a config with a specified tool, you can write it in two ways:

    STONE:
        - tool: DIAMOND_PICKAXE
          chance: 20%
          drop: STONE
    STONE:
        - tool: 278
          chance: 20%
          drop: STONE

Both methods work and you have 20% chance of getting stone instead of cobblestone with a diamond pickaxe, no matter the durability of it. You can also specify multiple tools:

    STONE:
        - tool: [IRON_PICKAXE, DIAMOND_PICKAXE]
          chance: 20%
          drop: STONE

OtherDrops also supports tools as ID number:

    STONE:
        - tool: [257, 278] # This syntax crashes Otherdrops prior to version 2.8b.221
          chance: 20%
          drop: STONE

Otherdrops also supports durability - eg. 257@0-20. It doesn't care if the interval is greater than the max data value a tool can get. For example an iron pickaxe has 251 uses. It means that data value can be from 0 (brand new) to 251 (broken). Setting 0-9999 is just being lazy (I don't want to check the max use of each tool, I will just put 0-9999 and it will cover all data values, since not a single tool in vanilla minecraft exceeds 9999 uses (max is 1562 for diamond tools)). But be careful with modded tools as some can exceed 9999 uses depending on the mod. Why is this feature interesting ? Because you can create configs where durability will trigger different results:

    STONE:
        - tool: [257@0-63, 278@0-390] # Brand new pickaxe quite efficient
          chance: 20%
          drop: STONE
        - tool: [257@64-128, 278@391-780] # Average pickaxe, possible double drop
          chance: 10%
          drop: COBBLESTONE
          quantity: 2
        - tool: [257@129-192, 278@781-1170] # This pickaxe is damaged and not efficient
          chance: 20%
          drop: NOTHING
        - tool: [257@193-251, 278@1171-1562] # Wasted pickaxe, use with caution
          chance: 3%
          message: "Your pickaxe broke and hurt you."
          damageattacker: 8
          damagetool: 400

    CREATURE_UNDEAD: # The killing blow is the 777th use of the sword = insane drop occurs
        - tool: 276@777
          drop: DIAMOND_SWORD@!DAMAGE_UNDEAD#10,FIRE_ASPECT#5@!~Angelic Ray # Use enchantments_ignore_level: true in otherdrops-config.yml to allow any enchantment level to be set
          message: "Lucky ! %p just dropped one of the Legendary Five: Angelic Ray !"
    CREATURE_UNDEAD: # Angelic Ray really doesn't like undeads (need Essentials)
        - action: LEFT_CLICK
          tool: DIAMOND_SWORD
          lorename: Angelic Ray
          chance: 50%
          command: "/!*butcher 3" # Unless you are surrounded by mobs, should only kill the undead you fight (kill anything within 3 block radius around you)
          event: LIGHTNING@HARMLESS # Well, its an Angelic ray after all !

This concludes what I tested so far. I will edit in a few hours to add the use of data values to create "virtual" entities.