SheepIt Render Farm - A free distributed render farm for Blender
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
TurboRender - Rendering at your workstation?
ZBrush - ZBrush is a digital sculpting and painting software solution.
SuperRenders Farm - SuperRendersFarm.COM is a CPU & GPU cloud render farm, supporting all 3D Render Engines: Arnold, Redshift, Octane, Vray, and more.
Cinema 4D - Cinema 4D is a 3D modeling, animation, motion graphics and rendering application.