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LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
Floorplanner - Floor plan interior design software. Design your house, home, room, apartment, kitchen, bathroom, bedroom, office or classroom online for free or sell real estate better with interactive 2D and 3D floorplans.
NttCAD - Free 2D/3D CAD software, easy to use and multi-platform
Sweet Home 3D - Sweet Home 3D is a free interior design application that helps to draw the plan of house, arrange furniture on it and visit the results in 3D.
TYCAD - TYCAD is a application for computer aided drafting (CAD) in two dimensions (2D).
SketchUp - 3D for Everyone