Bruno
https://www.usebruno.com/
https://github.com/usebruno/bruno
Alternative to postman, that's fully local and syncs to git easily. Unlike hoppskotch and insomnia that are free, but offer paid sync, Bruno just works in git. Unlike others, it doesn't dump JSON that's hard to diff, but has its own easily diffable format. You can share your collections in your existing git, with your existing accounts and PRs.
Also has integrated CLI testing.
He plans to sell GRPC later for money. HTTP and GraphQL API works now. https://www.usebruno.com/pricing