Native to JMeter, Throughput Controller<http://jmeter.apache.org/usermanual/component_reference.html#Throughput_Controller>is the only one I can remember that controls throughput. About JMeter plugins <http://jmeter-plugins.org>, the Throughput Shapping Timer <http://jmeter-plugins.org/wiki/ThroughputShapingTimer/> can also be used to achieve this.
Remember to use a considerable amount of threads to maintain your throughput. Sometimes it can exceed two or three times the desired rps. Response times affect your throughput, so you'll have to consider this when defining the amount of threads used to maintain your desired rps.
