Rex Guo - Computational Artist

Maya - Alias's high-end 3D modelling, animation and rendering application. Maya is almost entirely built from a graph. If you have access to its SDK, take a look at you will realise the extent to which the graph-based programming model is applied.

Below are screenshots of Hypershade in action.

SoftImage XSI - Avid's high-end 3D application. A competitor to Maya, SoftImage's shading mechanism, called the Render Tree (used to be called Shade Tree) is used to build shaders, is based on graphs too.

SoftImage's compositing is also done using graphs, called the FX Tree.

Rendering tutorials at XSIBase.com.

SoftImage XSI Behaviour

(coming soon)

Lightwave

(coming soon)

Houdini

(coming soon)

Shake from Apple is the compositing application used in the Lord of the Rings movies.

OpenDX - IBM's open-source scientific visualisation software.

DirectShow - Part of DirectX, DirectShow is Microsoft's framework for media-based application. It uses Filter Graphs to chain source, effects and sink nodes together.

Buzz - The most popular and free software-based sound and music synthesizer.

LabVIEW - National Instrument's measurement and automation software uses Virtual Instruments to monitor and control hardware.

RT/Shader from RTzen is a graph-based GPU shader modelling environment.

Unreal Engine 3 from Epic Games uses graphs to build their materials. The Unreal Engine 3 has been chosen by Microsoft Game Studios to power its games for the Next-Gen XBox platform.

Virtools

jMAX

(coming soon)

WireFusion

(coming soon)

Reaktor - Native Instruments

Apple Quartz Composer

meso/VVVV

(coming soon)

VTK - Kitware's scientific visualisation software.

(coming soon)