Prediki
Prediki is a peer-to-peer platform for opinion research and collective intelligence built on prediction market methodology. Developed by DOD member Hubertus Hofkirchner, it was presented at the 2017 Designing Open Democracy event alongside Nicolas Gruen's talk on isegoria and citizens' juries.
The two presentations are complementary: Gruen's argument concerns who should decide (randomly selected citizens), while Prediki addresses how to aggregate and surface considered opinion at scale.
See the Democracy Landscape entry for a full description of how the platform works.