Kusama, built by Parity Technologies, is created by the same team behind Polkadot. Parity Technologies was founded by the renowned computer scientist and programmer Gavin Wood, who is also a co-founder of Ethereum.
Kusama describes itself as the "wild cousin of Polkadot," and is an experimental blockchain platform that offers large-scale interoperability and a scalable architecture for developers. The platform is designed to provide a testing environment for developers who want to innovate and deploy their own blockchains, serving as a preparatory network before launching on Polkadot. However, many projects choose to keep their final products on Kusama.
Kusama is built on Substrate, a blockchain construction kit developed by Parity Technologies. Kusama’s code is almost identical to that of Polkadot, the most successful interoperability blockchain platform.
Source: CoinMarketCap