Fusion is an inter-operable cryptofinance platform that is being developed by the creators of Qtum and VeCahin. They hope to address many of the usability, scalability, and interoperability issues that have plagued other blockchain projects. Fusion's goal is to facilitate financial services for cryptocurrencies across different blockchains, and to enable additional financial services in the cryptofinance sphere.
Fusion will use distributed nodes to generate and manage the private keys of other blockchains. This will enable a new layer to operate on top of other tokens. This layer will "fuse" them and will allow the execution of smart contracts across different blockchains. Off-chain values can also be mapped on the chain and interact with the tokens

Circle is one of the oldest and most established blockchain-based financial companies. Circle offers several financial products and is a major player in the cryptocurrency sector. Their primary goal is to provide an easy on and off ramp to the crypto market that will encourage adoption and increase integration with other financial markets.
The company recently acquired the Poloniex exchange and now offers payment, trading, and investment options for a limited number of tokens.
Circle has received hundreds of millions of dollars in investments and has offices in several countries. They are fully regulated in the US and US, and provide services to people in over 20 countries.
Circle is now developing a fiat based token called USDC tat they hope will add greater stability to the crypto market.