FIC Network may be worth a look. They're building a decentralized marketplace for fixed income. I'll post some links to jumpstart your research:

https://medium.com/fic-network/bonds-on-blockchain-f3dfac3e16b6

Dav and Quant seem like a good one to check out as well.

https://medium.com/@BlockchainSeers/top-3-ongoing-ico-picks-april-22-2018-d81a12f7c3c6