MCEdit

Read some tutorials about it, it takes some time to get used to the controls.

MCedit use your RAM memeory. From my point it was pretty easy to know how you use the controls. You use W, A, S and D to move forward, backward, down and up. And Z and X to lift up and down marked objects. I recommend this 3D tools because you save more time to use this, then us W.E and VoxelSniper.

MCEdit is a very great 3D tool. You can for example replace, undo and past big constructions. It also contains "Filters". Filters make it pretty simpler to make custom maps/terrain. You can also make custom filters. As I sad before, if you have juts a small amount of memorey on MCEdit it will shut or it will take mutch longer. MCEdit alos supports texturepack.

You should check out the official home page, Sethbling and TrynPlauge1.0 on YouTube.

you also need a decent computer to use it...i find it real hard running it at 3fps

MCEdit is a fairly small program. It is easy to use, atleast for basic functions like making a giant room or a wall. Creating spheres or copying a structure is simple as well. You may have heard of SethBling, he uses MCEdit filters to make epic things.

I for one, haven't used any filters as I dont MCEdit too much.
Check the filters out here


There are a ton of tutorials for MCEdit out there on youtube, check'em out if you find something hard to understand.