AngularJS Class Provider (wrapper for John Resig's Simple Object Inheritance Class at https://github.com/tracker1/core-js/blob/master/js-extensions/040-Class.js)

app.js

angular.module('myApp', ['class']);

class.js

(function(){
    var module = angular.module('class', []);

    module.provider('Class', function() {
        this.$get = function() {

            var initializing = false, fnTest = /xyz/.test(function(){xyz;}) ? /\b_super\b/ : /.*/;

            // The base Class implementation (does nothing)
            var Class = function(){};

            // Create a new Class that inherits from this class
            Class.extend = function(prop) {
                var _super = this.prototype;

                // Instantiate a base class (but only create the instance,
                // don't run the init constructor)
                initializing = true;
                var prototype = new this();
                initializing = false;

                // Copy the properties over onto the new prototype
                for (var name in prop) {
                    // Check if we're overwriting an existing function
                    prototype[name] = typeof prop[name] == "function" &&
                    typeof _super[name] == "function" && fnTest.test(prop[name]) ?
                    (function(name, fn){
                        return function() {
                            var tmp = this._super;

                            // Add a new ._super() method that is the same method
                            // but on the super-class
                            this._super = _super[name];

                            // The method only need to be bound temporarily, so we
                            // remove it when we're done executing
                            var ret = fn.apply(this, arguments);
                            this._super = tmp;

                            return ret;
                        };
                    })(name, prop[name]) :
                    prop[name];
                }

                // The dummy class constructor
                function Class() {
                    // All construction is actually done in the init method
                    if ( !initializing && this.init )
                        this.init.apply(this, arguments);
                }

                // Populate our constructed prototype object
                Class.prototype = prototype;

                // Enforce the constructor to be what we expect
                Class.constructor = Class;

                // And make this class extendable
                Class.extend = arguments.callee;

                return Class;
            };

            return Class;
        };
    });
    // };
})();

controllers.js

angular.module('myApp.controllers', [])
    .controller('SomeCtrl', ['$scope', ConcreteService', function($scope, ConcreteService) {
        var service = new ConcreteService();
        $scope.property = service.someFunction();
    }]);

index.html

<script src="js/class.js" type="text/javascript"></script>

services.js

angular.module('myApp.services', ['class'])
    .factory('AbstractService', ['Class'
        function(Class){
            var AbstractService = Class.extend({
                init: function() { // Constructor
                    // object initialisation
                }
            });
            return AbstractService;
        }
    ])
    .factory('ConcreteService', ['AbstractService',
        function(AbstractService) {
            var ConcreteService = AbstractService.extend({
                init: function() { // Constructor
                    this._super(); // call parent initialiser
                }
            });

            return ConcreteService;
        }
    ]);