Mosquitto is an open source implementation of a server for version 3 of the mqtt protocol. IBM have a closed source version of this server, known as Really Small Message Broker (rsmb). The plan is to make this a more or less drop in replacement. See the following links for more information on mqtt: http://mqtt.org/ http://publib.boulder.ibm.com/infocenter/wmbhelp/v6r0m0/topic/com.ibm.etools.mft.doc/ac10840_.htm Mosquitto project information is available at the following locations: http://mosquitto.org/ (main homepage) http://launchpad.net/mosquitto (bug tracking, translations) http://bitbucket.org/oojah/mosquitto (hg source code repository) Mosquitto was written by Roger Light