GoodyBags

GoodyBags allows you to create custom loot bags (similar to the Thaumcraft loot bags) through JSON files. You can find information about that here. 

There are currently 3 types of bags you can create:

• Spawn- Spawns in a player's inventory when they first join the world. Meant to replace the inventory spam that has become current modded Minecraft. I guess you can use it for other things, too.
• Loot- Generates in dungeon chests with a configurable weight.
• Prize- Meant to be given to players as a reward for completing something. Similar to the HQM bags.

Currently there is no support for NBT. I will look into that at a later date.

Here is an example of a spawn bag:

{
 "bagType": "SPAWN",
 "name": "Spawn Bag 1",
 "rarityType": "uncommon",
 "stackList": [
 {
 "name": "minecraft:chainmail_helmet",
 "metadata": 0,
 "amount": 1
 }
 ]
}