Bruno is pretty decent, though I don’t like that it’s not fully FOSS. The whole premium feature stuff is closed source, if I’m not mistaken.

I’ve been searching for alternatives as well, especially since Insomnia introduced mandatory account creation.

I think Yaak is pretty good and I recently found out about Voiden, though I haven’t had a chance to try it out yet.

Edit: I forgot to mention that if you’re using IntelliJ Ultimate for what you’re doing, it has a built-in HTTP client too. We use that a lot at work, because then you can have the requests directly together with your application’s source code inside your repository, which is kinda handy.