Is there a reference for the standard available ActiveXObject objects? so far I know of:
There's no such thing as "standard" ActiveX/COM objects. The ProgIDs you listed belong to just a few of a great number of Windows and third-party software components that expose their functionality via COM.
If you just want to know what ProgIDs are registered on your computer, you can find a list under the HKEY_CLASSES_ROOT registry key.