DigiDesign
This project was a term project for Electronic Design Automation course during my senior year at IIT Kharagpur.
DigiDesign is a gate level designer for VHDL code. It currently only supports placing AND, OR and NOT gates (but then if you have NAND, you have everything :P). You place the gates as you wish, connect them with wires (the wires automatically snap to the gate input and outputs). Then click File > Save As, and a file called topmodule.vhd will be saved in the current folder, with the VHDL code you can import into your electronic simulator.
Download the source code.
Download the binary.
This program and its source code is licensed under the BSD 2-Clause license.
Last updated sometime in 2007.