Polygluttony was my original reason for making this too - I wanted an easy way to run solutions to Project Euler problems in different languages.

If you're interested each of the Docker Exec image repositories contains examples e.g.

https://github.com/docker-exec/haskell/tree/v1.0.0/test https://github.com/docker-exec/d/tree/v1.0.0/test https://github.com/docker-exec/racket/tree/v1.0.0/test etc