http://www-asim.lip6.fr/recherche/alliance/

VLSI toolchain.

Open source

Seems to have strong industry standing

Closed source / commercial and $$$$$ (I think I've heard a license costs more than my house)

http://www.peardrop.co.uk/glade/

VLSI toolchain.

Closed source but free?

http://www.klayout.de/

Layout editor.

Open source

http://vlsi.cornell.edu/magic/

Layout editor. Seems pretty popular in academia.

Open source

Find some info on this…

Find some info on this…

https://github.com/JohnDMcMaster/ocean

Sea of gates editor.

Open source

Closed source / commercial

http://www2.selu.edu/Academics/Faculty/ck/paps/VerilogPaper.pdf

Research only, source code not given