EssentialPIM - EssentialPIM is a free Personal Information Manager that keeps up with the times and lets you manage appointments, tasks, notes, contacts, password entries and email messages across multiple devices and cloud applications.
RabbitMQ - RabbitMQ is an open source message broker software.
Todo.txt - Track your tasks and projects in a plain text file, todo.txt. A todo.
Ethereum - Ethereum is a decentralized platform for applications that run exactly as programmed without any chance of fraud, censorship or third-party interference.
Task Coach - Task Coach is a simple open source todo manager to keep track of personal tasks and todo lists.
Hyperledger - Hyperledger is a multi-project open source collaborative effort hosted by The Linux Foundation, created to advance cross-industry blockchain technologies.