Sygma is a modular, open-source, cross-chain connectivity protocol that enables developers to extend their applications across EVM, Substrate, and other ecosystems. It provides a versatile and flexible framework for building cross-chain use cases in areas like governance, DeFi, gaming, and more. Key features include general message passing, support for EVM and Substrate assets, and competitive fees. Sygma is live on mainnet and fosters a community of open-source contributors to enhance cross-chain development and user experience.