See http://www.codelode.com

It's shareware.

Textweb reads, writes, and edits networks of cells stored in .twb files.  Each cell in a network has a name and a text field. 

There are 3 panes in Textweb's screen: the cell list, the text pane, and the output pane.  Panes may be resized by dragging their separators. 

Billed as a Hypertext Notepad for Windows and Pocket PC 2003.