hi, i searched for a free voxeleditor - fyi:

first i found ken silvermans slab6, but it doesnt work on my pc with my mouse
http://advsys.net/ken/download.htm#slab6
now i found a japanese editor cube kingdom, and the english mod of it:
http://www.modminecraft.com/minecraft-planner-cube-kingdom-v2-0-english-mod/
if you save in the cubekingdom-format .cko easy to understand.
everything is separeted by 0d 0a - he saved all in textformat?
from position 12 stands the number of voxels in ascii for example the asciicode of 4 if there are 4 voxels (followed by od oa).
then the position (the first voxel is at position 100, 100, 100), then the color or number of texture. between positon and color is no 0d/0a, instead there is 20,66(=space,ff) if the color follows.

someone found a better free voxeleditor?

Minecraft .

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irc://irc.freenode.net/#polyvox

We actually have a (short) list of voxel editors on the wiki: http://www.volumesoffun.com/polyvox/documentation/dokuwiki/voxel_editors

I've been using Sproxel for Voxeliens. The trees were made with it and imported directly, while the voxelien designs were prototyped with it but later remade in Blender (because they are actually meshes, not voxels).

Be aware that version 0.5 appears to have some performance problems so I've mostly been using version 0.4.

Oh, and I came accross this one which looks really nice but I haven't played with it yet: Qubicle Constructor

I've added it to the wiki as well.