Apache JMeter, locust, Low Orbit Ion Cannon, Loader.io, OctoPerf, Loadrunner, k6 Cloud, blitz.io, Fast DDoS Attack Cmd, LoadForge, Taurus, StresStimulus, SilkPerformer, Gatling.io, YandexTank, LoadBooster, Loadster, Appvance, WebLOAD, UbikLoadPack are some alternatives to CloudTest.