Resonance
Local-first, zero-account Open Source API Client
...It supports REST, GraphQL, gRPC, WebSocket, Server-Sent Events, and MQTT protocols. Users can create requests, inspect responses, and organize API collections in human-readable YAML files. The software provides authentication tools, environment variables, and secure credential storage through operating system keychains. It includes request scripting, automated tests, mock servers, and schema validation. Developers can import existing API specifications and generate client code in multiple languages. Built with Tauri and Rust, Resonance offers a lightweight, local-first alternative to conventional API testing platforms.