Either an older version of Micrografx/ABC/Igrafx Flow Charter or maybe Visual Thought (Free AFAIR).
Edit:
//snip
Visual Thought is a cross-platform diagramming & flowcharting tool for the enterprise that runs on Windows 95/NT and UNIX. It lets you effortlessly create technical and documentation graphics, network diagrams, flowcharts, org charts, software design diagrams (UML, Booch, OMT, Objectory, etc.), circuit & logic diagrams and business and presentation graphics. Choose from a library of drag-and-drop palettes, or create your own with user-definable shapes. Edit your work easily with 100 levels of undo. Publish your diagrams into Word or FrameMaker documents or right onto the Web with GIF and JPEG output and instant clickable imagemaps.
Visual Thought moves ideas onto the screen quickly by making it easy for the user to drag-and-drop shapes and make rubberbanding connections between objects. The tool is used by engineers, software developers and technical professionals to draw flowcharts, software diagrams, process and block diagrams, network diagrams, organizational charts, circuit and logic diagrams, and even World Wide Web graphics.
Since being acquired by E*TRADE, Inc. in September 1999, Confluent ceased development, support and sales of Visual Thought. However, you can now download the full version for free. It's good for 14 years and you can install it on as many computers as you like.
License Keys for Visual Thought: Windows: 0356 9674 3262 8895 9914 96
Be sure and copy this key and use it after install
A "Home Site" and download for this software seems to be unavailable. I have uploaded the file to Freeware4u.com :)
//snap
http://freeware4u.com/modules/mydownloads/singlefile.php?lid=141&title=Visual%20Thought