It is difficult to know where to start with such a vast range services in finance. I think giving one for a variety of project type categories is a good way to approach it:
Payments : OmiseGO – which is by no means a new project – offers instant peer-to-peer transactions that enable financial institutions to do real-time transactions. It can work worldwide across asset classes, geographies, and applications.
StableCoins : Reserve is very interesting, backed by a small number of collateral tokens, each of which are tokenised dollars. Frictionless cross-border payments and a great way to store money in countries like Venezuela.
Investment : Betoken is a Crowd-powered asset management protocol that lets you automate your investment. Furthermore, its key features, including active management, user-owned, user-governed, full collateralization, and no fees.
Liquidity and Exchanges : Airswap offers peer-to-peer trading on the Ethereum network. Moreover, it is easy to use with key features such as no fees, no deposits, no sign-ups, secure, intuitive, and liquid.
Lending and Credit : SALT is a lending platform that provides comprehensive coverage, collateral wallets, loan health, and more. Furthermore, it offers loans backed by XRP, Dash, Dogecoin, Bitcoin Cash, Pax Gold, Crypto, Ether, and Bitcoin.
Prediciton Markets : Bodhi is an interesting decentralized prediction market solution. It offers windows, Mac, and Linux desktop applications. It also comes with a web version.
Insurance : Etherisc is a decentralized insurance protocol that enables businesses and developers to build insurance products. Looks very cool and something in this line has huge potential, getting the insurance industry onto a blockchain would inject huge amounts of money into the DeFi space.
Yearn.finance Proposal to Create ETH 2.0 Validator Vault Could be a Game-Changer for Staking, which could also provide liquidity, and lending, which could fuel the DeFi community.
will go in-depth on Melon Port