What software can I use to design an integrated circuit ? I need the same software that chipmakers use. I am working on a startup to create a 64bit RISC V processor with embedded FPGA fabric. So, for 22, 32 and 40nm , what software can I use to prepare all the layers so I can later send the design to TSMC or GlobalFoundries and this way it would go directly to manufacturing without hiring expensive engineers at TSMC. I want to save on NRE. Is there any open source tool I can use? I have read it costs from a few million to 500 million to make a chip, there is no way I will ever have that amount of money.