PRTG Network Monitor is an all-inclusive monitoring software solution developed by Paessler. Equipped with an easy-to-use, intuitive interface with a cutting-edge monitoring engine, PRTG Network Monitor optimizes connections and workloads as well as reduces operational costs by avoiding outages while saving time and controlling service level agreements (SLAs). The solution is packed with specialized monitoring features that include flexible alerting, cluster failover solution, distributed monitoring, in-depth reporting, maps and dashboards, and more.
Hammerhead is a web site coverage, HTTP load generator, HTTP benchmarking, and stress testing tool. It has been designed to emulate multiple users from multiple IP addresses at maximum speed (unlike it's interpreted counterparts).