Decentralized Prediction Markets
Prediction markets are exchange-traded markets created to trade the outcome of events. The market prices can indicate what the crowd thinks the probability of the event is.

Augur
Augur is a decentralized oracle and peer to peer protocol for prediction markets.

Omen.eth
Omen uses the Gnosis conditional token framework to give anyone the ability to create a prediction market - be it in the realm of crypto, sports, politics, entertainment, etc. Interview with Omen team.

PlotX
PlotX is a cross-chain prediction market protocol that enables crypto traders to make crypto-asset price predictions in hourly, daily & weekly time frames.

Polymarket
Polymarket is an information markets platform, where you can bet on the highly-debated topics and earn for being right.