Biome Tweaker link
Aroma Backup link Note that this mod requires Aroma1997Core.
WorldEdit is a great builder’s mod. I use it mostly to paste schematics into my worlds. Sometimes I use it for terraforming. But there are a lot of uses for it. Check it out.
Finder Compass by atomicstryker is an invaluable tool for quickly locating ores. You can choose which blocks to look for–I chose diamonds, gold, emeralds, lapis and redstone. The recipe only requires 4 iron ingots and one redstone. In the image (left), the compass shows the directions for gold, diamonds, lapis and redstone. The range is configurable