RabbitMQ - RabbitMQ is an open source message broker software.
Square - Square helps millions of sellers run their business-from secure credit card processing to point of sale solutions. Get paid faster with Square. Sign up today!
Ethereum - Ethereum is a decentralized platform for applications that run exactly as programmed without any chance of fraud, censorship or third-party interference.
Lightspeed - retail and restaurant point-of-sale, ecommerce, and omnichannel solution
Hyperledger - Hyperledger is a multi-project open source collaborative effort hosted by The Linux Foundation, created to advance cross-industry blockchain technologies.
ITSCircle POS - ITSCircle POS is a point of sale solution for retail stores.