HTTPie for Terminal, Insomnia REST Client, soapUI, Requestly, Graphical HTTP Client, Thunder Client, Bruno, Hoppscotch, Milkman, Stoplight, Insomnium, Apibucket.io, Httper, Advanced REST Client, RapidAPI for Mac, Guide API, NativeRest, Servistate, Restfox, REST Client for Android, Apiman, RESTed, Nozomi, HttpMaster, Apidog, Treblle, apptalk.ninja, RestCase, API Fortress, Resting, Iron Test, Loadmill, Assertible, rest-client, Firecamp, Restlet, APITree, JunoRestClient, WebMaestro, TestMace, RESTtest, GraphicalHttpClient, APICombo, CurlHub.io, FRequest are some alternatives to Postman.