Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Sketch Isometric Plugin - Generate isometric views from artboards and rectangles
3D Cityplanner - Urban and real estate development at your fingertips. With the 3D Cityplanner it’s possible to create, visualize, analyze and share 3d plans online.
MagicPattern - The best design toolbox with 10+ tools for anyone
Silo - Silo is a focused 3D modeling application with the ability to effortlessly switch between organically sculpting high-poly models and precisely controlling hard-edged surfaces.
Isometric Love - Cute isometric objects for designers