UML Designer - UML Designer provides a set of common diagrams to work with UML 2.5 models.
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.
Diagramo - Diagramo is an online flowchart software - diagrams (create, edit and share)
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.
ARIS Express - ARIS Express is based on the proven ARIS methodology and industry standards.
SketchUp - 3D for Everyone