I haven't used this yet, but there's also https://github.com/robotocore/robotocore. It came up on HN a few days ago: https://news.ycombinator.com/item?id=47420619.

It's not a complete replacement, but if you're in a Python ecosystem, you might find Moto to be of interest.

https://github.com/getmoto/moto

I haven't evaluated it deeply yet, but I saw https://github.com/hectorvent/floci

I am about to test this one http://docs.getmoto.org/en/latest/index.html

I've fiddled around with https://docs.getmoto.org/en/latest/docs/server_mode.html

It didn't support the one thing I wanted but it was so easy to find the right place in the code, I was happy. Never got to continue it though or turn it into a PR

MinIO is a drop in replacement for S3. I plan on switching to this as soon as I can. For now, I just pinned localstack to 4.14.0

For S3 emulation, I'm using rustfs. It's very compact and fast to run, and you can just start it with `docker run` inside tests if you don't want to set up a full integration test harness.

I used an SQS-on-top-of-Redis emulation before, but I can't recommended it now (no updates for 6 years).

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