RabbitMQ - RabbitMQ is an open source message broker software.
Charles Proxy - HTTP proxy / HTTP monitor / Reverse Proxy
Ethereum - Ethereum is a decentralized platform for applications that run exactly as programmed without any chance of fraud, censorship or third-party interference.
Wireshark - Wireshark is a network protocol analyzer for Unix and Windows. It lets you capture and interactively browse the traffic running on a computer network.
Hyperledger - Hyperledger is a multi-project open source collaborative effort hosted by The Linux Foundation, created to advance cross-industry blockchain technologies.
Postman - The Collaboration Platform for API Development