Apache JMeter, Postman, Insomnia REST Client, Thunder Client, Bruno, Hoppscotch, Stoplight, Insomnium, Apibucket.io, Storm.dev, Advanced REST Client, Runscope, NativeRest, Hermes JMS, AITable, Restfox, REST Client for Android, JMS Browser, Nozomi, Checkly, HttpMaster, Apidog, RestCase, API Fortress, Iron Test, Loadmill, Assertible, rest-client, Mock/it, Restlet, HailStorm, JunoRestClient, WebMaestro, TestMace, Bearer, APICombo, Droptice are some alternatives to SoapUI.