The Multi-Collateral DAI stablecoin uses multiple types of collateral to back its value and an interest rate mechanism to stabilize its price. It is designed to be a digital currency with a stable value. MakerDAO is the decentralized autonomous organization that manages DAI and works to combat its price volatility. Multi-Collateral DAI was launched in November, 2019 and is meant to be a successor to the Single-Collateral DAI, that will eventually be phased out. The new stablecoin will enable new features to the Maker Protocol, such as the the Dai Savings Rate (DSR), as well as additional types of asset collateral.

Dignity is a stablecoin pegged to gold, that was developed by the company Cryptobontix. Each DIG token is pegged to the worth of 0.02445 grams of gold, which was worth exactly $1.00 at the time of the Dignity whitepaper.
Cryptobontix's portfolio of stablecoins are based on a partnership with bullion suppliers. Each individual token acts as a security on a 15-year convertible mortgage. The DIG token is pegged to the value of gold. Every year, 1/15th of the tokens can be redeemed for gold valued at around $1.00.
Cryptobontix does not actually own all of the physical gold. The company plans on spending its profits on acquiring the actual bullion that token holders will have the option of converting.

HUSD token is a stablecoin that was created by a Hong Kong based company called Stable Universal. HUSD is backed by US Dollars in a 1:1 ratio that are held in a trust company. The HUSD stablecoin is designed to have a governance structure that will increase security, liquidity, and transparency. Monthly audits of HUSD's reserves are conducted by an independent accounting firm to ensure that the 1:1 backing is maintained.