Rajesh Verilog FAQ  
   General Verilog resource that includes a FAQ, tutorials, and commercial information.
   http://www.angelfire.com/in/rajesh52/verilog.html

Sandstrom Engineering  
   HDL pre-synthesis tools which check code for synthesizability. Then suggest replacement code where problems are found.
   http://www.sandstrom.org/about.htm

Nova Engineering  
   Megafunctions are modular, DSP algorithms and functional blocks for custom use in PLD or ASIC designs.
   http://www.nova-eng.com/vhdl.html

Accolade Design Automation  
   VHDL design, simulation and synthesis tools.
   http://www.acc-eda.com/

Aldec  
   HDL design entry and simulation software for programmable logic designers.
   http://www.aldec.com/

CAST, Inc.  
   Tools for intellectual property (IP) management. Plus synthesizable cores and simulation models using VHDL and Verilog.
   http://www.cast-inc.com/

Doulus  
   Lots of VHDL and Verilog resources. Including PaceMaker Self-Teach software.
   http://www.doulos.co.uk/

Exemplar Logic, Inc.  
   Provides LeonardoSpectrum which is a CPLD, FPGA and desktop ASIC synthesis solution.
   http://www.exemplar.com/

iMODL  
   The iValidate toolset comprises ready-to-use functional verification tools and simulation models.
   http://www.imodl.com/

Verilog Dot Com  
   Verilog resources page. Includes FAQ, books and links. Also verilog aware Emacs add on.
   http://www.verilog.com/

Freeware Verilog & VHDL  
   This is the home page for a Freeware Verilog,VHDL and Analog Mixed Signal project (a.k.a. the V-2000 project, still in its infancy).
   http://www.v-ms.com/

The Hamburg VHDL Archive  
   A collection of public-domain or shareware, VHDL documentation, models, and tools.
   http://tech-www.informatik.uni-hamburg.de/vhdl/vhdl.html

Saros  
   Offering a full suite of VHDL and Verilog design tools, from design-entry, simulation and synthesis to verification and training.
   http://www.saros.co.uk/

Sutherland HDL, Inc.  
   Provides Verilog HDL and Verilog PLI training workshops and consulting services.
   http://www.sutherland-hdl.com/

Symphony EDA  
   VHDL Simili a freeware VHDL compiler/simulator. It supports VHDL'93, Vital, and SDF. Support for Altera, Atmel, Cypress and Xilinx.
   http://www.symphonyeda.com/

Synplicity  
   Logic synthesis and verification products for FPGA and ASIC designers.
   http://www.synplicity.com/

Translogic  
   EASE and EALE provide HDL aware entry tools, both graphical and text based. Also providing Linux support.
   http://www.translogiccorp.com/

VIZEF  
   Provide graphical HDL tools for design and verification.
   http://www.vizef.demon.co.uk/

SynaptiCAD  
   Provides Verilog, VHDL, TDML, logic analyzer, pattern generator, and SPICE tools.
   http://www.syncad.com/

eXsultation  
   Specialize in full turn-key, customer facility training programs in VHDL, Verilog,C++ modeling, formal verification, and FPGA design.
   http://www.exsultation.com/

Esperan  
   VHDL, Verilog and FPGA training courses held in the US, Europe and the UK.
   http://www.esperan.com/

C Level Design  
   Offers a design and verification environment for C/C++ with synthesis to VHDL and Verilog code.
   http://www.cleveldesign.com/

Verilog-AMS  
   The Verilog-AMS Technical Subcommittee has been created with the charter to develop, update and promote analog and mixed signal extensions to the Verilog (IEEE-1364) language.
   http://www.eda.org/verilog-ams/

Green Mountain  
   VHDL compilers and design environments, including Windows, DOS and Linux support.
   http://www.gmvhdl.com/

Time Rover  
   Provides tools for aiding Verilog development. Including The Temporal Rover for automatic verification of protocols and Verilog Java PLI.
   http://www.time-rover.com/

TimingTool - Online timing diagram editor  
   Free to use online timing diagram editor. Timing diagrams are saved in TDML format. Translators from TDML to DXF, VHDL, and Verilog are also supplied.
   http://www.timingtool.com/

Cypress Warp Tools  
   VHDL and Verilog tools for use with the Cypress CPLD family.
   http://www.cypress.com/pld/warp.html

Experimental Computing Laboratory  
   Includes papers, presentations, conference publications and SAVANT VHDL, a free VHDL analyser and simulator. From University of Cincinnati.
   http://www.ececs.uc.edu/~paw

Calyptech Design Services  
   Offers ASIC and FPGA design and verification services, drivers and tools. Includes product and service overview and PDF detailed product specifications available.
   http://www.calyptech.com/