Apps similar to httpYac Rest Client include Postman, which has a free version. Other options are Insomnia REST Client, Yaak, Hoppscotch and HTTP Toolkit. There's no shortage of API Clients like httpYac Rest Client, with more than 50 alternatives for Mac, Windows, Linux, the web and Chrome OS.
Hurl is a command line tool that runs HTTP requests defined in a simple plain text format. It can capture values, evaluate queries on headers and body response. It is very versatile: it can be used for both fetching data and testing HTTP sessions.
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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.
Thunder Client is a hand-crafted lightweight Http Client extension for Visual Studio Code. No separate download needed, Just install the extension from VS Code marketplace.
Milkman is a JavaFx-based workbench for crafting requests / responses. It is not limited to e.g. http (or more specifically rest) requests but can be extended in any imaginable way. It is optimized for fast startup and efficient workflow.
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Runscope helps you monitor, log and measure API usage to solve API problems fast. Automatically monitor APIs without any coding. Runscope provides complete logging for all of your API traffic. Track down troublesome API calls with powerful search.
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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.
RESTClient can be used to test variety of HTTP communications and RESTful webservices. Friendly GUI, rich functionalities.
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A REST client for almost any web service (Firefox and Chrome extension).
