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Hoppscotch
Open source API development ecosystem - https://hoppscotch.io (open-source alternative to Postman, Insomnia)
Alternative to: 
Postman
Postman
Bruno
Opensource IDE For Exploring and Testing API's (lightweight alternative to Postman/Insomnia)
Alternative to: Postman
Postman
Insomnia
The open-source, cross-platform API client for GraphQL, REST, WebSockets, SSE and gRPC. With Cloud, Local and Git storage.
Alternative to: Postman
Postman