Fractone has released version 0.1 (alpha) of WallsOfSound, a new free VST3 plug-in for Windows.
The idea with the WallsOfSound plug-in is to emulate, in a way most general as possible, the reverberant effects of sound traveling from sources to receivers in a three-dimensional space - bounded, fully or partially, by walls of specified sonic reflectivity coefficients. Rather than control reverb and echo with the conventional knob or slider-driven, single-dimensional delay parameters and the like, reverberant effects would be created by actually creating a virtual room and laying out sources and receivers in the three dimensions - a more intuitive approach.
WallsOfSound is compatible with these 3D room/floor planning/editing packages: Sweet Home 3D, Google Sketchup 8.