Category: Office and Client Development
Description: Add-in Express .NET, from the company with the same name, allows developers to build Microsoft Office, extensions such as smart tags, task panes, Excel user-defined functions and application-specific keyboard shortcuts. The product plugs into Visual Studio 2003 and 2005, as well as Borland's Delphi for .NET.
The latest version, Add-in Express .NET 2007, supports Office 2007 user interface elements like the Ribbon and advanced toolbars and lets developers customize so-called "advanced regions" in Outlook 2007. It also offers vision-neutral programming, which means that add-ins written for Office 2000 will work for the 2003 and 2007 versions of the product suite as well.
Company site: http://www.add-in-express.com/
Sample downloads: http://www.add-in-express.com/downloads/free-addins.php