Havven is a decentralized exchange and stable coin that is also planning to use the collateralized-backed smart contracts like Bitshares for their bitUSD. They will have 2 types of tokens, one for staking in the exchange system and one for transactions.
Here's a good introduction on their plan:
https://blog.havven.io/havven-overview-2d4bb98a3be9
If you find this link useful and sign up, please use my referral code:
https://airdrop.havven.io?kid=KX97T