Polygon Network is a sidechain-based scaling solution for public blockchains. It is based on an adapted implementation of the Plasma framework. Polygon provides scalability while ensuring a superior user experience in a secured and decentralized manner. It has a working implementation for Ethereum on Kovan Testnet. Polygon intends to support other blockchains in the future which will enable it to provide interoperability features alongside offering scalability to existing public blockchains. (Source)