This isn't a complete list, as more and more software companies design their product to be automatable, but it is a start.
http://fox.wikis.com/wc.dll?Wiki~AutomationObjects~SoftwareEng

>Hi,
>Thank you for reply.
>I know about intellisense feature for COM automation, and it is great!!!
>However, before I can use it, how could I know that "word.application" is the class definition to auotmate MS word? How could I know "excel.application" should used to CREATEOBJECT()?