3s is a project mainly written in Python, it's free.
s3 prototype using cyclone and other cool stuff
Port of http://github.com/facebook/tornado/raw/master/tornado/s3server.py (s3 clone on tornado) TODO:
RUNNING $ twistd -ny se.tac
TESTING: create bucket: $ curl --request PUT "http://localhost:4000/meh/"
put some data (README file): curl --data "@README" --request PUT --header "Content-Type: text/plain" "http://localhost:4000/meh/README"
retrieve: curl http://localhost:4000/meh/README