Alternative System Concepts, Inc.
   On-Line Documentation.
   http://www.ascinc.com/

Amontec VHDL Window
   Provides complete online language reference and examples of common constructs.
   http://www.amontec.com/vhdl_part.shtml

CAST, Inc.
   An intellectual property provider that develops and supports synthesizable cores and simulation models for electronic design using VHDL.
   http://www.cast-inc.com/

Doctor VHDL Design Services and Training
   VHDL and ASIC / FPGA training courses as well as design services.
   http://www.drvhdl.com/

Doulos KnowHow - VHDL Models
   Generic Large-capacity RAM Model, Analog-to-Digital Converter Model, Finite Impulse Response (FIR) Filter, Image Processing Cache Register Array (IPCRA), Carry Look Ahead Blocks, Synchronizer Scaler, Heap Sort Parallel, Simple RAM Model, Spectrum Spread
   http://www.doulos.com/knowhow/vhdl_models/

Free Model Foundry: FMF
   Premier site for VHDL component simulation models.
   http://www.eda.org/fmf/wwwpages/

Hamburg VHDL Archive
   Home of many free, open source designs in VHDL.
   http://tech-www.informatik.uni-hamburg.de/vhdl/vhdl.html

Hello, World Program
   Written in VHDL.
   http://www2.latech.edu/~acm/helloworld/VHDL.html

RASSP Support Page for VHDL
   Models, Guidelines and Coding Styles, Standards, Courses/Tutorials, Tools
   http://www.eda.org/rassp/vhdl/index.html

SAVANT
   The University of Cincinnati's free VHDL analyzer/parallel simulator.
   http://www.ececs.uc.edu/~paw/savant/

VHDL Designer's Guide
   What is VHDL? A Brief History of VHDL. Tutorial.
   http://www.doulos.com/knowhow/vhdl_designers_guide/

VHDL International (VI)
   organization dedicated to cooperatively and proactively promoting the Very High Speed Integrated Circuit (VHSIC) Hardware Description Language (VHDL) as a standard worldwide language for the design and description of electronic systems
   http://vhdl.org/

VHDL Memo
   All VHDL keywords, all VHDL syntax. VHDL quick documentation.
   http://www.amontec.com/fix/vhdl_memo/

VHDL Mini Reference
   For quick access.
   http://www.eng.auburn.edu/department/ee/mgc/vhdl.html

VHDL Models
   From Free Model Foundry site.
   http://vhdl.org/fmf/wwwpages/VHDL_models.html

VHDL Verification Course
   Introduction to VHDL verification techniques. It assumes some familiarity with VHDL.
   http://home.tiscali.de/laugenweck/

comp.lang.vhdl archive
   Frequently Asked Questions and answers.
   http://vhdl.org/comp.lang.vhdl/