Erigon
Formerly TurboGeth, Erigon is an Ethereum client built to enable performance optimizations. Erigon is written in Go and licensed under the GNU LGPLv3.
Geth
This is the most popular and majority Ethereum Client implementation written in Go, Geth fully open source and is now ported for Gnosis chain.
Nethermind
Nethermind is an Execution layer client developed by the Nethermind team.
Reth
Gnosis‑compatible Reth client — not a fork, but an extension built with the NodeBuilder API.