This completely depends on your use-case, but I've personally found that the edit and re-send [1] features of Firefox are enough for my purposes most of the time.
[1] https://firefox-source-docs.mozilla.org/devtools-user/networ...
Currently using Insomnium [1], a fork of Insomnia before the login demands. Most likely found it here at HN [2] and decided to try it out.
HTTPie is a good alternative. Check it out here https://httpie.io/
Insomnia is a Postman alternative: https://insomnia.rest/
I like restclient. There's no UI, just .http files with a simple format for describing requests. there's a version for emacs and vscode that are mostly interoperable.
I would say use insomnia but it’s going down the same path as postman. There are some nice VSCode extensions that integrate a REST client directly into the editor.
Enjoy it while it lasts: https://paw.cloud/. Really good.
Not native, but Thunder Client is a VS Code extension that I've found pretty handy.
Yaak, made by the original maker of Insomnia.
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Bruno is a FOSS alternative, it is an Electron app, but widely used already: https://www.usebruno.com/downloads
What I like about it that requests are defined in a simple markup language called "Bru" and stores as simple text files, you can easily throw them around.