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Expressive-IV Demo - Graphical Front End to Verilog or VHDL Editor
Using powerful new graphical techniques developed specifically for ASIC/FPGA design, coupled with a singular focus allows Expressive-IV to drop right into your design flow and add instant benefit. Instead of using a text editor to produce structural HDL files and a general purpose drawing package to create one off diagrams, you now use just one tool - Expressive-IV.
preview: http://www.expressivesystems.com