queuing

zeromq

No Repo
* Lightweight queuing system.

rabbitmq

No Repo
* Robust, fully featured, cross distro queuing system.

nsq

No Repo
* A realtime distributed messaging platform.

kafka

No Repo
* Extremely high performance publish/subscribe message system.

gearman

No Repo
* Fast multi-language queuing/job processing platform.

beanstalkd

No Repo
* A simple, fast work queue.

activemq

No Repo
* Java message broker.