I have created a new module for Drupal 7, which harneses the power of Slim Framework to create an API for Drupal content types and users.
Slim is a PHP micro framework that helps you quickly write simple yet powerful web applications and APIs.
At its core, Slim is a dispatcher that receives an HTTP request, invokes an appropriate callback routine, and returns an HTTP response.
The module creates 8 endpoints which return data in JSON format and are accessable via a GET or POST request to create, read, update or delete nodes.
I have plans to port this code to Drupal 8, but my current development path for this module before that is to add connectivity for the excellent Search API module https://www.drupal.org/project/search_api
It felt good to give back to the Drupal project.
Peace to all.