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It's Postman[1], a Chrome app for making HTTP requests/testing API's that has a ridiculously full featured free version.

1: https://www.getpostman.com/

That said, it's worth paying the $10 to upgrade so that you can automatically include authentication credentials in your requests. (E.g. hit the auth endpoint to get a token, and then have that token automatically included in all your subsequent requests.)

Do Chrome apps really not get to share credentials/cookies with the rest of Chrome? Postman asked me to sign in with my google account, and proceeded to show me a login form that looked like a google login page but with no way for me to verify the domain.

There is an API for Chrome Apps to get authentication tokens, and they are probably using it in interactive mode, which shows just what you saw: https://developer.chrome.com/apps/app_identity#getAuthToken-...

It's postman, see: https://chrome.google.com/webstore/detail/postman/fhbjgbifli...

As others have said, that tool is Postman. I'd also suggest looking at Paw.

https://luckymarmot.com/paw

I love Paw. I doesn't do much more than Postman (as far as I can tell), but it's much more pleasant to use.