DesignWorks Lite 

With DesignWorks Lite you can: Draw, save, edit and print complete, professional circuit diagrams using powerful features like bussing, multi-level Undo/Redo, and automatic gate packaging.
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SimApp 

Simulation tool for automatic control systems in the time and frequency domain based on the idea of block diagrams. Full visual block diagram editor. Simulation results are displayed in diagrams and data tables. More than 90 basic function blocks.
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Paraben's Flow Charter 

Paraben's Flow Charter is a full-featured flow charting program that allows you to design your own flow charts & diagrams quickly & easily. It keeps track of figures (shapes) that make up a flowchart. Now anyone can make a flow chart.
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Sequence Diagram Editor 

Modeling tool that simplifies and speeds up the creation and maintenance of UML sequence diagrams and telecom/wrieless call flow diagrams. It automatically takes care of layout and formatting (across multiple pages if needed).
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InSight Diagrammer 

Draw flowcharts, business and organizational charts, network diagrams and graphs. InSight Diagrammer provides several collections of shapes and images for creating professional drawings. It also lets you define your own node shapes and images.
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Schematic 

Schematic is a diagramming tool that allows complex diagrams to be drawn with ease. Schematic allows you to combine text, pictures, shapes and connectors to create clear and informative diagrams. UML, Electrical, Network, DFD, ERD plus many more...
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