Instant Structures Mod (ISM) allows you to place structures like a house by only one click. It not only simplified to build a city and show you greate buildings created by other users but also contains items that can replace blocks again other ones, place blocks, build a square or expand blocks in a variable area.
Download link: Instant Structures Mod 1.8/1.7.10/1.7.2 by MaggiCraft