Arbitrum Nitro

OP Stack

ethereum-optimism/optimism

Popular

Optimism's open-source rollup stack behind OP Mainnet, Base and the Superchain; the most-forked L2 framework.

ZKsync

matter-labs/zksync-era

Matter Labs' ZK rollup and ZK Stack for launching interoperable validity-proof chains (Elastic Network).

Starknet

starknet.io

STARK-based validity rollup on Ethereum with native account abstraction; contracts are written in Cairo.

Cosmos SDK

cosmos/cosmos-sdk

Popular

Go framework for building sovereign, IBC-connected application blockchains on CometBFT consensus.

Polkadot SDK

paritytech/polkadot-sdk

Parity's Substrate, FRAME and Cumulus toolkit for building Polkadot parachains and standalone chains.

Sui

MystenLabs/sui

Rising

Mysten Labs' object-centric, parallel-execution L1 programmed in Move; one of the fastest-growing ecosystems.

Aptos

aptos-labs/aptos-core

Move-based L1 with Block-STM parallel execution, built by former Diem engineers.

Avalanche

ava-labs/avalanchego

AvalancheGo node and tooling for launching EVM-compatible sovereign L1s (formerly subnets) on Avalanche.

Hyperledger Fabric

hyperledger/fabric

Permissioned enterprise blockchain framework with pluggable consensus and chaincode in Go, Java or Node.