Here is a list of ActiveX controls used by WSS 3.0 and MOSS 2007.
These ActiveX controls listed here should be in Microsoft Office SharePoint Server 2007 (MOSS) as well. Jose Barreto has added a few missing ones on his blog :
http://blogs.technet.com/josebda/archive/2007/03/26/searching-the-visible-moss-2007-code-for-activex-references.aspx
Below are the mentioned ActiveX cotrols, copied from that posting for in-place reference:
DiagramLauncher
Server Files: TEMPLATE\LAYOUTS\1033\BFORM.JS, TEMPLATE\LAYOUTS\1033\CORE.JS, TEMPLATE\LAYOUTS\1033\INIT.JS, TEMPLATE\LAYOUTS\1033\OWS.JS
Client File: DGRMLNCH.DLL
Function: Launch Microsoft Office Visio to open diagrams
Non-IE behavior: The browser will offer to save the file locally instead of launching the application. The option to "Open with Visio" will not show.
DigitalSignatures
Server Files: TEMPLATE\LAYOUTS\INC\1033\IntlCoreStrings.js, TEMPLATE\LAYOUTS\INC\Core.js, TEMPLATE\LAYOUTS\INC\intlcorestrings.js, TEMPLATE\LAYOUTS\SignatureDetails.FormServer.aspx
Function: Digital Signature for Microsoft Office clients
Non-IE behavior: You cannot sign documents, but you can view signatures.
ExportDatabase
Server Files: TEMPLATE\LAYOUTS\1033\CORE.JS, TEMPLATE\LAYOUTS\viewtype.aspx, TEMPLATE\LAYOUTS\1033\OWS.JS
Client File: OWSSUPP.DLL
Function: Export list to a Microsoft Office Access database
Non-IE behavior: Option to "Open with Access" will not show.
Ppactivex
Server Files: TEMPLATE\CONTROLTEMPLATES\sldlibtemplates.ascx, TEMPLATE\FEATURES\SlideLibrary\SldLib\schema.xml, TEMPLATE\LAYOUTS\1033\SLDLIB.JS
Function: Integration with PowerPoint for Slide Library Templates
Non-IE behavior: The Slide Library integration with PowerPoint will not work.
PersonalSite
Client File: PORTAL~1.DLL
Also Known As: PersonalSite Class, PortalConnect.PersonalSite
Function: Adds your my site to a list of SharePoint sites maintained by the Office client
Non-IE behavior: No client-side knowledge of where your mysite is located.