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vHDL Obfuscator is an small GUI to obfuscate and reformat HDL files
VHDL and Verilog HDL are standards languages for hardware description. Sometimes is necessary to share the source HDL file but maintaining a little level of control and protection of the intellectual property. This tool generate obfuscated code that is almost unreadable to humans, but is still readable to compilers and simulators.
This tool use GHDL (https://sourceforge.net/projects/ghdl-updates/), HDLObf (https://sourceforge.net/projects/hdlobf/), IcarusVerilog (https://sourceforge.net/projects/iverilog/) and was created in Lazarus (http://www.lazarus-ide.org/)
Endit is a text editor mean to HDL source code writing and hacking, like Verilog and VHDL. It integrated a open source verilog compiler , Icarusverilog compiler, in it which is also an excellent open source verilog compiler.
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Provides a GPL'd test suite for verification of the verilog language. This project is affiliated with the IcarusVerilog compiler effort at icarus.com, and test reports are collected from that project.