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.
Roomtodo - Simple yet powerful online tool for interior design and floorplans with built in walkthrough module.
DreamPlan - DreamPlan Home Design software makes it easy to plan a new house or remodeling project. 3D interior, exterior and landscape design for your home! Free download.
InnoPlanner - InnoPlanner is a commercial based interior designing software.
Icovia Space Planner - Icovia Space Planner is the name of online designing software for creating floor plans and doing many other type of designing as well.
MagicPlan - The floor plan creation app magicplan lets you create dimensioned floor plans without actively measuring or drawing. With its Augmented Reality.