Culver City-based personalized medicine and healthcare technology developer NantHealth announced this morning that it has acquired The OpenNMS Group, a developer of open source, network management software. Financial details of the acquisition were not announced. NantHealth said that OpenNMS will operate as a subsidiary of NantHealth. OpenNMS is a developer of open soure, network monitoring tools; NantHealth explained the acquisition will expand and diversify its software portfolio and service offering. OpenNMS is based in Morrisville, NC.