roomeon - Roomeon is simply a best in the class interior designing and decorating software that offers the 3D based designing features and functions to its users.
draw.io - Online diagramming application
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
LucidChart - LucidChart is the missing link in online productivity suites. LucidChart allows users to create, collaborate on, and publish attractive flowcharts and other diagrams from a web browser.
InnoPlanner - InnoPlanner is a commercial based interior designing software.
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.