hello! there is a very old addon here https://github.com/stmh/ofxOpenSceneGraph not sure if it's still relevant with current OF/OSG and/or if it fits your expectations.

GitHub discussions don't get a lot of visibility, if you have other questions I recommend the forum https://forum.openframeworks.cc

To answer your question, generally yes. openFrameworks is distributed under the MIT License. This gives everyone the freedoms to use openFrameworks in any context: commercial or non-commercial, public or private, open or closed source. > See licence

However, pending on your platform and usage, you will want to check all licences.

Thanks @artificiel I didn't know about this plugin. It does interest me, however it makes more sense to implement OSD over OSG