Blender - Blender is the open source, cross platform suite of tools for 3D creation.
draw.io - Online diagramming application
Autodesk 3DS Max - 3ds Max is software for 3D modeling, animation, rendering, and visualization. Create stunning game enrivonments, design visualizations, and virtual reality experiences.
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.
ZBrush - ZBrush is a digital sculpting and painting software solution.
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.