restclient.el is described as 'This is a tool to manually explore and test HTTP REST webservices. Runs queries from a plain-text query sheet, displays results as a pretty-printed XML, JSON and even images' and is a HTTP Client in the development category. There are more than 50 alternatives to restclient.el for a variety of platforms, including Mac, Windows, Linux, Web-based and Flathub apps. The best restclient.el alternative is cURL, which is both free and Open Source. Other great apps like restclient.el are Postman, Insomnia REST Client, Yaak and Hoppscotch.
Upcoming API testing tool in beta, built in GoLang, supporting HTTP/gRPC, workspaces, environments, request management, and various content types. Features include dark mode, local data storage, Postman import, environment variable setting, and request chaining.
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Used httpyac CLI tool underneath, which helps you execute _.http and _.rest files. This can be used to quickly execute a single *.http file, but also to execute all files in a folder. httpyac supports HTTP, Rest, GraphQL, WebSocket und gRPC...
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