TouchDesigner is described as 'Complete authoring tool for building interactive 3D art, visualizations, prototypes and UIs. Derivative makes and supports TouchDesigner and offers their services to do custom production using TouchDesigner' and is an app in the video & movies category. There are more than 25 alternatives to TouchDesigner for a variety of platforms, including Windows, Mac, Linux, Web-based and iPad apps. The best TouchDesigner alternative is Autodesk Maya. It's not free, so if you're looking for a free alternative, you could try Vvvv or TiXL. Other great apps like TouchDesigner are Autodesk 3ds Max, Houdini, Pure Data and Vuo.
Smode is a real-time 2D/3D creation, compositing and video-mapping engine developed by D/Labs. Everything with Smode is real-time: you can change any parameter at anytime without having to make expensive re-renderings.
Fugio is a free, open source, visual programming system for making digital art and creative projects using a wide range of technologies, for Windows, OS X, and Linux (including Raspberry Pi).
With RenderJuice, render like the big studios. Just upload your .blend or .c4d file in your browser and start rendering. Cut down your render timelines and costs. Speed up renders by using the most powerful GPUs and algorithms from your workstation.
Cables is a tool for creating beautiful interactive content. An easy to navigate, node-based interface provides users with basic operators such as mathematical functions, shapes and materials that can be connected with virtual cables to create practically any imaginable scene.
Open source, browser based, node editor
Fragmentarium is an open source, cross-platform IDE for exploring pixel based graphics on the GPU.
VDMX5 was created from the ground up to meet the demands of realtime video performance. Built around a robust data processing architecture it was designed to be used with whatever hardware- or software- you've got available.
A game engine written in Python, extending support across multiple GPU devices with 3D rendering, PBR Renderer and much more.
Polydust is a 3D modeling app made for iPad. For low poly, polygonal and voxel graphics. Create beautiful models with powerful operations and modifiers.
Visibox allows performers to control video like a musical instrument. Quickly drop in videos, images, or audio files to create immersive stadium-style concert visuals in any cafe, club, or live stream.
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I like smode as an alternative as it's optomised for realtime visuals.