What are some alternatives?
When comparing EQUINOX-3D and Clara.io, you can also consider the following products
Maya - Maya in Launchpad
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
SelfCAD - SelfCAD is an online 3D modeling and slicing software.
Cinema 4D - Cinema 4D is a 3D modeling, animation, motion graphics and rendering application.
MilkShape 3D - The MilkShape 3D website has been down for almost one week.
MODO - Modo by Foundry brings you the next generation of 3D modeling, texturing and rendering tools in a powerful integrated software package.