Open Source Excellence is a way to access information for the .opensource-excellence.com domain in the Ethereum Name Service (ENS) on the Ropsten Testnet from DNS

What is Open Source Excellence? Open Source Excellence is EthDNS on the Ropsten Testnet for the .opensource-excellence domain. Because .opensource-excellence is not a registered DNS top-level domain it is normally inaccessible from DNS, but by appending .com to the domain the relevant information can be obtained. For example, a DNS A record request for mydomain.opensource-excellence.com would look up the A records in ENS for mydomain.opensource-excellence.