SiliconBlue,
Achronix
Tabula
Full List can be found here...
TSMC (based off Tiwan, 28 nm process announced, 40 nm state-of-the-art as of Feb 2010)
GloFo ( AMD merged its foundry business with Chartered Semiconductor to form GloFo, )
Samsung (Korea, 28 nm announced)
Austria Microsystem (200 nm mixed signal process)
Cadence,
Ciranova,
Magma,
Mentor Graphics,
SpringSoft,
Synopsys
IP Core marketplace, Design-Reuse
Synopsys (IP Cores and design tools)
OpenSPARC
LEON3 (Open Source 32 bit SPARC v8)
ARM Cortex M1
GNU Radio
Synthesizing OpenSPARC Design lab
A Good presentation on Verilog 2001 (PDF ~400kB)
gEDA : GPL EDA tools
EDA Standards accellera.org
MMIX design is a musings of a beautiful mind on modern RISC processor architectures.
http://scpd.stanford.edu/knuth/index.jsp
http://www-cs-faculty.stanford.edu/~uno/mmix.html
http://www-cs-faculty.stanford.edu/~uno/mmixware.html
http://www-cs-faculty.stanford.edu/~uno/mmix-news.html
http://www.springerlink.com/content/v8qtq27c84t8/
An excellent PhD Thesis along with GPL source code for Java Machine.