Guzzle Alternatives

With RestCase you can supercharges the API development process resulting in improved team collaboration, reduced development time, better testing and increased overall productivity. The cloud-based platform allows teams to collaboratively create REST and ASYNC APIs using an intuitive browser-based visual designer, automatically generate documentation, tests and mocks. The platform further enables rapid iteration and testing by creating a mock of the API that any team member can make calls against immediately without waiting for the actual development and deployment of the API, eliminating impediments from various development teams.

HTTPie is a command-line HTTP client that makes it easy to interact and work with RESTful APIs. The CLI provided by HTTPie is designed to be as human-friendly as possible and is loved by developers creating services for the web. HTTPie can be used for testing, debugging, and generally interacting with  any API and HTTP server.

..

With Insomnia you can design, debug and deploy APIs. Insomnia is free API design platform and REST Client developed for macOS, Linux and Window. The application makes it easy to create and group requests, specify environment variables, authentication and generate code snippets. You can also get all the details on responses. View the whole request timeline, status codes, body, headers, cookies and much more. The software also makes it easy to orginize your projects with workspaces, folders, environments, drag-and-drop requests, and easily import and export your data. Insomnia integrates with API gateways such as the Kong API Gateway, and Kong for Kubernetes. While Insomnia comes with a free-forever license, the software provides premium monthly subscriptions for E2EE data sync and advanced collaboration features.

..

Web file access system for your Active Directory users and Windows file system. Must have for educational and other organisations with Windows users.

Transmit is an FTP client and file transfer application for macOS. With Transmit, you can upload, download, and manage files on tons of servers with an easy, familiar, and powerful UI.