I don't know a lot of IEO bounties. i've seen economi bounty and sessia, so I would be glad if you pm me some good bounties of upcoming IEOs.
I can just recommended some projects all of those IEO (without Origin project) will be started/finished on IDAX Foundation.
1. Azbit: IEO started in Bitforex.
2. Cryptomarketads: IEO will be started in IDAX foundation.
3. xCrypto: IEO already happened in IDAX exchange.
4. Origin: IEO partnership with Dobitrade exchange.
5. Migranet: IEO completed on IDAX.