Houzz - The largest collection of interior design and decorating ideas on the Internet, including kitchens and bathrooms.
SketchUp - 3D for Everyone
Superdraft AU - Superdraft helps you coordinate the planning, design and build of your dream project in one place, on time and on budget. Start planning for free.
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.
Abitaz - On this platform users can find inspiration and solutions to their decorating/remodelling problems.
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.