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vvvv itself is not open source, but it offers different open interfaces for people to write their own nodes:

Plugins

most general interface for writing multipurpose nodes

Freeframes

video effects/analysis nodes

Effects

vertex- and pixelshader

Modules

reusable vvvv-patches

VST

audio effects/analysis nodes

Many users share their work mostly under the LGPL opensource license. Those nodes, not being part of the main executable are called addons and their sources are being hosted on github

All contributed addons are available via a separately downloadable addonpack in order to allow independent release cycles of the main vvvv application and user submitted content.