Thanks, Luke, for mentioning Alliance. I had forgotten about it, but now
have read this book which has a nice example of using it:

http://www.cc.toin.ac.jp/sc/palacios/openbook/vlsie.pdf

The typical unix command line style reminds me of the old Berkeley
tools. I am sure this makes makefile fans very happy (just as vi-like
commands in Magic is "intuitive" to some people).

This list of free VLSI tools seems reasonably complete:

http://www.vlsiacademy.org/open-source-cad-tools.html

Besides standard cells, I have studied other design methods in the past
such as PPL (Path Programmable Logic from the University of Utah) or
Gate Matrix from Bell Labs.

https://dl.acm.org/citation.cfm?id=74714
http://cdmbuntu.lib.utah.edu/cdm/ref/collection/uspace/id/1351
https://ieeexplore.ieee.org/document/1156074

I don't currently have access to ACM and IEEE online stuff, but these
references might be useful to some people. These are not open source
tools, however. I actually bought a copy of the PPL tools back in 1990
but can't use them due to a silly protection scheme. But the ideas might
be worth looking at.

-- Jecel
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