this is a wiki post. feel free to add to it.
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Processing.org - simple yet robust programming language developed with education in mind
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OpenFrameworks - an open source C++ toolkit for creative coding
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Software oscilloscope - source code available on GitHub
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Pure Data - open source visual programming environment
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Vector Synthesis - code library to output oscilloscope graphics from pure data (fb group)
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REWEREHERE - max patch for Rutt-Etra style scan processing (fb group)
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TouchDesigner - node based visual programming language for real-time interactive multimedia
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Isadora - node-based interface for realtime video / projetcion / interaction - super simple to get started, tutorials
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VDMX - VJ environment
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Coge VJ - modular MacOS VJ software
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r_e_c_u_r - open diy video sampler for Raspberry Pi 3, demo, fb group
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Hydra - distributed, modular, browser-based platform for live-coding visuals (fb group, chat)
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Signal culture app club - app series created in max msp for real-time video manipulation
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Phosphortron - emulates the phosphor trails found in CRTs
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Video_Waaave_2 - a video mixer, framebuffer delay, and feedback resynthesis engine built in openFrameworks, demo
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Acid cam - open source app for coloring/glitching YT demo playlist
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Modulaser - working with laser style visuals, demo
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online reaction diffusion playground - experiment with the grey scott implementation of a reaction diffusion system in your browser
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Vsynth - modular videosynth library for Max/Jitter.
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Lumen - semi-modular videosynth app for OSX.
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Magic Music Visuals - audio/midi/osc multichannel reactive visuals for Windows/macOS.
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OBS - great for recording/streaming/compositing/feedback
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Black Syphon - Syphon software to send and receive video streams to and from Blackmagic Design hardware
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Syphoner - share the graphical window’s content of any open application and stream it in real-time, full frame, to any Syphon client applicaton
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Syphon recorder - Record video from any Syphon application, and capture stills.