Editor for topic combinations + guide creation in visual way.
https://github.com/wbkd/react-flow
https://github.com/projectstorm/react-diagrams
https://github.com/DrummerHead/react-flow-diagram
https://github.com/alibaba/GGEditor
https://github.com/MrBlenny/react-flow-chart
Rete = visual diagrams (study guide flows / graphs)