What are some alternatives?
When comparing Cobalt and SketchUp, you can also consider the following products
Raygun - Raygun gives developers meaningful insights into problems affecting their applications. Discover issues - Understand the problem - Fix things faster.
FreeCAD - An open-source parametric 3D modeler
SpiraTest - Manage your project's requirements, test cases and bugs. SpiraTest test management software is the best on the market
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Rapise - Discover Rapise, the cross-browser, automated software testing tool with the most powerful and flexible test automation features on the market. Try it today!
LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.