draw.io - Online diagramming application
Lumion - Easily turn your CAD projects into architectural visualization videos and images. Compatible SketchUp and 3D BIM Tools, such as Revit, ArchiCAD and Allplan.
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.
Twinmotion - Designed by architects for architects, veteran visualization studio KA-RA has announced the release...
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.