https://www.stellar.org/ White paper link. Github link. Stellar was founded in 2014.Stellar is structured as a Non Profit Organization. Stellar is an open-sourced payment protocol founded by Jed McCaleb and Joyce Kim. Jed was co-founder of Ripple  and Mt. Gox. Joyce Kim is now co-founded a blockchain based venture capital firm called SparkChain Capital. Currently Stellar’s crypto-currency called