We use ElasticMQ to have an SQS compatible service for local development. We use it with docker-compose locally. In our remote envs we use SQS.

So far I had not problems with ElasticMQ.

I'm much intrigued by the small LOC count of SmoothMQ. When I compare it to ElasticMQ it's much smaller (probably by using sqlite's features).

https://github.com/softwaremill/elasticmq