The Collaborative API Development Platform - Insomnia

Insomnia is an open-source API client for designing debugging and testing APIs with support for GraphQL REST WebSocket and gRPC protocols in a clean intuitive interface. The tool provides environment variables for managing different configurations across development staging and production environments. Insomnia supports plugin extensions and code generation for over 30 programming languages. The Core version is free and open-source while Sync and Enterprise plans add cloud storage and team collaboration features.