Cosmos
ATOM
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Currency
Layer 0
Cosmos is a network of interconnected blockchains — the Internet of Blockchains. It provides a framework (Cosmos SDK) for building custom blockchains that can communicate via the Inter-Blockchain Communication (IBC) protocol. Dozens of major blockchain networks are built with the Cosmos SDK.
Polkadot
DOT
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Currency
Layer 0
Polkadot is a Layer 0 multi-chain network that allows different blockchains to interoperate. Created by Ethereum co-founder Gavin Wood, it uses a relay chain and parachain architecture letting multiple specialised blockchains run in parallel and communicate securely.