grpcurl
Command-line tool to interact with gRPC servers
ghz
gRPC benchmarking and load testing tool
HTTPie
Human-friendly command-line HTTP client for APIs
Thunder Client
Lightweight REST API client for VS Code and JetBrains IDEs
Kreya
Privacy-first desktop API client for gRPC, REST and GraphQL
Apidog
All-in-one platform to design, debug, mock, test and document APIs