Someone posted https://hurl.dev/ below. It looks like a command-line alternative to this, with a similar format, and support for assertions.
We also wanted something text based, that could easily be integrated in a CI [2] for instance. We are using Hurl to test our web application (~2M unique visitors/month). Very happy with it currently, but there are really a lot of very good tools in this space (as we can see in these comments).
[1] https://hurl.dev