In-memory message queue with an Amazon SQS-compatible interface
Redis client and message queue for Clojure
Distributed messaging and streaming platform with low latency
The first messaging platform operating without user identifiers
Powerful Open Source Email Marketing app with analytics & segmentation
Comprehensive mailing tools for PHP
A lightweight framework to build chat applications, made in Swift
Small ANSI C lib for dropbox/windows azure communication
one server framework
Redis Simple Message Queue
A distributed, scalable, persistent, time sorted message queue
Disque is a distributed message broker
Low latency, high bandwidth IP for virtual machines
Simple, distributed message queue system (inactive)
HL7 message API and helper tools