I have compiled some common AS3 utility APIs for public use as specified under the MIT license.

The utilities APIs are comprised of the following:

DeepCopy:
Creates a Deep Copy of an object reference to a new memory address and returns the cloned object

HashMap:
Creates a HashMap of object key / values as well as provides a standard API for working with a HashMap

ICollectionViewSortHelper:
Provides an API for collection alpha / numerical, ascending / descending sorting

Introspection:
Provides a robust API which performs detailed object introspection on a specified type

IteratorFactory:
Factory Pattern implementation which provides an API for Iterator instantiation

ObjectIterator:
Iterator implementation which provides methods for iterating over an object

ArrayCollectionIterator:
Iterator implementation which provides methods for iterating over a Collection

ArrayIterator:
Iterator implementation which provides methods for iterating over an array

StringUtil:
All static class which extends mx.utils.StringUtil to add additional methods for working with Strings

AVM2MemoryUtil:
All static class which returns the current memory allocated to a Flash Player instance in bytes, kilobytes or megabytes

I will continue to add to the utils package and make the updates regularly available. You can download the swc as well as view the ASDoc