Quantom Zone by Stereowalker
Finally, Variety in Minecraft. Just Try Not To Get Infected or Eaten. Beware of THE Beast
Quantum Coins by Mint
Extremely customizable physical currency mod. Aimed more at server economies then SP use.
Quarry Craft by bor295
a mod initially made to provid some purple and gold decorationblocks grown out to be a quarrymod. weird huh?
QuarryPlus is an add-on for Buildcraft that adds Advanced Quarries and various other items
Quartz 'n' Steel Mod by redstoneCircutor, baddaspig
A simple mod that adds a few more quartz-related items! - Original Version