Plans API / Library is currently at version 4.0, for Minecraft 1.8.x. It provides modders a very flexible API to include in their own mods that allows them to customize the generation of instant structures. Plans uses a rules-based engine to generate Minecraft structures. A JSON file (*.plan.json), called a Plan contains all the properties and rules used to construct a particular structure. The Plan file can be very simple and straight-forward to a very complex set of Plans that substitutes blocks, adds support rules, connectors, conditions, spawners and chests.
The SGS Treasure! mod adds some adventure to vanilla Minecraft. Various different types of treasure chests are randomly buried throughout the Minecraft world. The chests require different types of keys to open them. The more rare the chest, the better the loot. You can locate an area where a treasure chest is buried by finding and digging under a graveyard or other new surface markers. Be warned, some chests may be buried in underground dungeons, guarded by unfriendly mobs. There also are treasure chests in caves, dungeons, sunken ships and under Wither Trees, or other randomly generated structures. As well, there are rare Wishing Wells placed throughout the realm which you can use discovered gold and silver coins on. Will you be the first one to discover Blockbeard's treasure!
I created this mod to introduce three metals, Steel, Titanium, and Autium, to help bridge the gap between Iron and Diamond. So you if you like a little more variety in your metals but not a slew of them, then this might be for you. MC1.8 coming soon.