Vilfredo is a platform I developed with my friend Derek Paterson, to reach consensus on an open question. It works by asking everybody in a group to propose their answer to the question and evaluate each other answer. It then analyses the evaluations to extract a shortlist of proposals that are representative of all participants. It uses this shortlist to ask participants to write new proposals.
I have several publications on the topic of Vilfredo. The code is available. And if you have an open question you want to pose your friends, you can use it on vilfredo.org. Consider that this work is often improving and I only publish when a major breakthrough is reached you can find some unexplained new features.