Simon Willison’s Weblog

aws-emulator. Finally, an official emulator from AWS to run tests against a local clone of their many different services without having to provision a paid API key to do so.

It's written in Rust by a huge swarm of agents - 29,684 commits in the first three weeks of the project. Swaminathan (Swami) Sivasubramanian wrote about how it came to be in a guest post on Werner Vogels' blog.

It currently requires Docker to run on macOS or Windows. I'm hoping they fix that in the future - it would be great if you could download a single binary and use that as part of a standard test suite in other languages and on other platforms.