BCB DX Lib: DirectX RAD development using Borland C++ Builder.
BCB-Tools.com: Creates the TDx_Library, a series of easy to use Borland C++ Builder components which translate and integrate entire sections of DirectX into native VCL components, supplying RAD DirectX toolsets. [Commercial]
Chilkat DirectX C++ Game Development Library: Provides a framework and C++ classes for developing DirectX applications. [Open source]
DirectX 5.0 Port for Mingw32 and Cygwin: This makes it possible to use DirectDraw with the Mingw32 or Cygwin free compiler environments.
DirectX 6.0 and Windows Media Technologies Bring Multimedia to Windows CE: Article about DirectX on Windows CE-based devices such as the Sega Dreamcast console.
DirectX eXperience: DirectX site with articles, tips & tricks, and a list of related books.
GameDev.net: Gives news and contains articles about DirectX.
Games Programming with DirectX 8 and C++: Help programmers who are new to DirectX get acquainted with the libraries, in particular DirectDraw and DirectInput.
Got Dot Net DirectX Resource Center: A DirectX section of Microsoft community site. Using DirectX at .NET platform.
Inside DirectX: Microsoft's authoritive book written by partners on the DirectX team contains many essential details for DirectDraw programming.
Microsoft DirectX Developer Center: Microsoft's official home site about DirectX.
Microsoft DirectX Downloads: Developers can download DirectX technologies, including DirectX 6.0, the DirectPlay 5.0A update, and other multimedia development tools and information.
Mr.Snow DirectX8 Column Gold: DirectX programming tutorial collection. [Commercial and free versions]
The Code Project: A programming site with a large section on DirectX. Includes articles, and links.
The X Zone: Technical articles, FAQ, samples, links.
The ZBuffer: A collection of news, resources and tutorials for Managed DirectX.
TripleBuffer Software: Contains DirectX tutorials, source code, and projects for both C++ and C#.