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
QuazarCraft by Qwiddle
This mod adds Quazar, a technologically advanced metal/crystal with magical properties. This ore can be used to make many decorative blocks and a multiblock 3x3x3 crafting table. Plants, World Gen, Armor, and Weapons have been added or will be soon. Machinery will come eventually.