HTTPie for Terminal, Postman, Insomnia REST Client, soapUI, Bruno, Hoppscotch, Apibucket.io, Httper, Advanced REST Client, RapidAPI for Mac, Guide API, NativeRest, HttpRequester, Servistate, Apiman, RESTed, API Fortress, Resting, Iron Test, Loadmill, Restlet, APITree, WebMaestro, RESTtest, CurlHub.io are some alternatives to Thunder Client.