Visual Thought -- "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." (Comments: Thanks Gabriel White!)