Ubuntu Electronics Remix

Ubuntu Electronics Remix (UER) is Ubuntu derivative with electronics software included. The aim of the project is to make using Ubuntu for electronics as easy as possible. UER provides a LiveDVD of open source electronics software. Simply download it, burn it to disk and put it in your PC, and start using the software.

http://mbmn.net/uer/

Verilog using Icarus Verilog
http://mbmn.net/uer/tutorials/verilog-using-icarus/