Geth
This is the most popular and majority Ethereum Client implementation written in Go, Geth fully open source and licensed under the GNU LGPL v3.
Repository: https://github.com/gnosischain/go-ethereum
Running as a system process
Installing geth
> git clone https://github.com/gnosischain/go-ethereum
> go install ./cmd/geth
Running geth
# Gnosis Mainnet
> geth --gnosis --authrpc.jwtsecret /path/to/jwt.hex
# Chiado Testnet
> geth --chiado --authrpc.jwtsecret /path/to/jwt.hex