Renderman, is only free for non commercial purposes. Fusion is free though.
Renderman is similar to cycles / vray / mentalray / blender internal / arnold / insert other renderers here… It takes a 3d scene description and outputs a coloured image with shadows / lighting / indirect lighting / subsurface scattering etc.etc.etc.
Fusion, is like Nuke / Blender Compositor… Which is more like after the renderer happens, extra effects happen to make it look more realistic… it is all 2D based… no 3d rendering happens here… they are like after effects but with nodes instead.
fusion has a 3d system where you can render stuff using an OpenGL or a Software Renderer, this isnt advanced as Cycles or BlenderInternal but for a lot of stuff its enough (take a look at videocopilots Element3d for AfterEffects. its also a OpenGL render and similar stuff you can do with the Fusion OpenGL renderer)
Thanks for the Replys guys,
So no need for them then ? Because i feel like blender can do things very very well, so why use these ? unless you dont want to pay for vRay i guess.
The only one i would use is the Dysion 7 i guess, or is the blender Compositor better ?