Alas, none had done it -- until yesterday, when Amazon announced their AWS SDK for JavaScript in the Browser. Theoretically, it does for their web services, what Dropbox did for theirs.

The SDK supports Amazon’s web identity federation feature (you wouldn’t want to add your AWS credentials in your HTML and JavaScript, after all).

Amazon Web Services (AWS) made public an open-source software development tool 'Strand Agent SDK' on the 21st, which allows for the development and operation of artificial intelligence (AI) agents.