Programmable Logic/Tools
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Programmable Logic
Design
XILINX Vivado
XILINX ISE WebPACK
(Discontinued - Legacy software)
Simulation
Icarus Verilog
(
Wikipedia article
)
ModelSim
XILINX ISE WebPACK
Synthesis
XILINX ISE WebPACK
Implementation
XILINX ISE WebPACK