Knots is a fork of the core client with more sane defaults and more configuration options. Miners have been using it for years. It is fully compatible with Bitcoin Core and is maintained by nostr:nprofile1qqs0m40g76hqmwqhhc9hrk3qfxxpsp5k3k9xgk24nsjf7v305u6xffcpzdmhxue69uhhwmm59e6hg7r09ehkuef0nv7zl8 a long time Bitcoin Dev. It's gaining popularity in response to core removing the op_return limit in the next release