Archicad is a software developed for architects, with excessive 3d house planning and a lot of facilities for the interior of houses. There are only releases for Windows and Mac OS X, there is no Linux port planned in next time.
education version for free
commercial free try, you couldn't save your work. w/o time limit
you can get a serial from official site for full version in 30 days limit...
Archicad 9.0 is especially designed for architects, it has a lot of facilities to build up a house. It also brings up a 3d emulation of the house and is useful for pupblishing the inside of the house.