If you are looking for free or standalone alternatives, technical communities often recommend:
It allows for the modification of port numbers and DSCP (Differentiated Services Code Point) settings to test Quality of Service (QoS) policies. wan killer 1.1 download
The WAN Killer tool allows network administrators to simulate heavy traffic loads to test for congestion, bottlenecks, and load balancing without using real application data. Customizable Traffic If you are looking for free or standalone
Because version 1.1 is legacy software (circa early 2010s), it is no longer hosted on SolarWinds' official website. They have replaced it with the inside their modern Network Performance Monitor (NPM). wan killer 1.1 download
Two virtual machines or physical PCs on an isolated switch. Do not connect to the internet.