Ph4 / Lithuania / Vilnius

One of the best programs for planners in 3D online.
There is a Russian language.
Distributed under the BSD license - open source.

Good video explanations. It is clear, as for the 3-dimensional graphics, it is difficult to understand through the dry text, it's easier to see once and everything becomes easier.
Intuitive interface.
The result can be embedded in the site, as shown below. There is a demo where you can spoil a ready-made layout.