If you are looking for additional solutions, you may also want to look at the just released cAPI REST API for Joomla (http://getcapi.org). It is powered by the Slim PHP micro-framework, provides a token and parameter management component with accompanying plugins defining major service route groups (and upcoming add-ons).
cAPI provides both simple username/password authentication (via URL arguments) and token authentication (passed through HTTP header). Content creation/updates/deletes are rudimentary at the moment, with additional functionality in the works.
You may read a longer description from a different answer here:
http://stackoverflow.com/questions/26340885/rest-api-for-joomla-3-0/32706378#32706378
Disclaimer: This is a commercial Joomla package development by me.