Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Toggl - Toggl is an online time tracking tool. It features 1-click time tracking and helps you see where your time goes. Free and paid versions are available.
FreeCAD - An open-source parametric 3D modeler
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
Sculptris - Sculptris: Enter a world of digital art without barriers.
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.