resterm

Resterm is a TUI (terminal user interface) HTTP client. Think Postman but entirely in your terminal. You compose requests, see responses, and manage collections without leaving the command line.

Go, Apache 2.0. The interface lets you build GET, POST, PUT, DELETE requests with headers, body, and query params. Responses render with syntax highlighting. Supports environment variables for switching between dev/staging/prod endpoints.

Fully free. No paid tier, no cloud sync, no accounts. It's a single binary. Solo developers who live in the terminal: this fits your workflow better than opening a GUI app for every API test. Small teams: works for individual use but no shared collections or team sync.

The catch: this is early-stage. No OAuth flows, no websocket testing, no scripting/automation, no request chaining. For quick one-off API calls it's pleasant. For complex API testing workflows, you still need Insomnia, Bruno, or a scripted approach with curl/httpie. And the lack of a homepage URL suggests the project is GitHub-only. Documentation lives in the README.