ofxAddons
openframeworks addon for a color picker gui.
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These branches have commits not yet on master — could be unmerged fixes or work in progress worth a look.
README
this addon has a dependency on ofxMSAInteractiveObject. a copy of ofxMSAInteractiveObject can be found in the addons folder of this example. the original ofxMSAInteractiveObject addon can be found here, https://github.com/memo/msalibs