Fluentd: Unified Logging Layer (project under CNCF)
Free and open source log management
Open source multi-protocol messaging broker
AMQP library for PHP
Job server in Go
Go client for AMQP 0.9.1
Tsung is a high-performance benchmark framework for various protocols including HTTP, XMPP, LDAP, etc.
Bunny is a popular, easy to use, well-maintained Ruby client for RabbitMQ (3.3+)
Celery client for Node.js
