RetroComputers by the_real_farfetchd
RetroComputers adds programmable computers to Minecraft. It's not like ComputerCraft though, in that it can be programmed in actual machine code, which means you can totally program your own OS if you know assembly!
Biome Bundle is a completely custom world generator containing a huge pack of over 400 original biomes with over 2000 structures including custom trees, rocks, caves, dungeons, villages and much more.
Vanilla Nether Metals by jriwanek", Knoxhack
Vanilla Nether Metals expands the vanilla ore generation to the Nether Dimension.