RabbitMQ - RabbitMQ is an open source message broker software.
Boomi - The #1 Integration Cloud - Build Integrations anytime, anywhere with no coding required using Dell Boomi's industry leading iPaaS platform.
Apache ActiveMQ - Apache ActiveMQ is an open source messaging and integration patterns server.
Postman - The Collaboration Platform for API Development
ZeroMQ - ZeroMQ is a high-performance asynchronous messaging library.
Zapier - Connect the apps you use everyday to automate your work and be more productive. 1000+ apps and easy integrations - get started in minutes.