The Zeus for Windows IDE, Version 3.97c has just been released:

  http://www.zeusedit.com

New to this version:

    Indent column highlighting
    Matched brace highlighting
    Improvements to the code folding
    Improvements to the smart indenting

Zeus is a multi-language editor with D being one of the languages supported.

Zeus does D language code folding, syntax highlighting etc. and can be easily configured to run the D compiler:

  http://www.zeusedit.com/forum/viewtopic.php?t=2465

NOTE: Zeus is shareware

Jussi Jumppanen
Author: Zeus for Windows IDE