ElasticMQ via NPM (requires Java)
I occasionally/often write some Node.js code that uses Amazon's SQS service.
ElasticMQ is super handy for testing that code without having to connect to
Amazon servers. I thought it would be nice if I could put
elasticmq in my
devDependencies so that other people wouldn't have to find and download the
version I had tested against, and now I can.
Also, I get a kind of perverse amusement out of it.