Verilog Quick reference Guide

1. for online Verilog-1995 Quick Reference Guide...
click here
http://sutherland-hdl.com/online_verilog_ref_guide/vlog_ref_top.html

2. verilog 2001 Quick reference as Searchable PDF Format....
click here
http://sutherland-hdl.com/online_verilog_ref_guide/verilog_2001_ref_guide.pdf

Computer Aids for VLSI Design

for online book click here ....
http://www.rulabinsky.com/cavd/

Verilog/VHDL Simulation tools

1. Active HDl from Aldec, for software details & reference manual click here
http://www.aldec.com/ActiveHDL/

2. Modelsim from Mentor Graphics , for software details & reference manual click here
http://www.model.com/resources/mainpage.asp