Links from The Investment FAQ: Stock Exchanges

Exchanges in North and South America

• The American Stock Exchange offers information about the companies listed on that exchange.
  http://www.amex.com/
• The Arizona Stock Exchange, operated by AZX Inc.
  http://www.azx.com/
• Information about Canadian stock and commodity exchanges (Alberta, Montreal, Toronto, Vancouver, and Winnepeg)
  http://www.telenium.ca
• The Chicago Board of Trade offers a pile of disclaimers as well as information about their activities.
  http://www.cbot.com/
• The Chicago Mercantile Exchange offers intraday currency quotes and daily settlement prices of all CME futures and options.
  http://www.cme.com/
• The Coffee, Sugar & Cocoa Exchange
  http://www.csce.com
• The Kansas City Board of Trade, the world's predominant marketplace for hard red winter wheat.
  
• The MidAmerica Commodity Exchange
  http://www.midam.com
• The Minneapolis Grain Exchange
  http://www.mgex.com
• The Montreal Exchange
  http://www.m-x.ca
• The NASDAQ offers information about the exchange and the companies listed there.
  http://www.nasdaq.com
• The New York Cotton Exchange
  http://www.nyce.com
• The New York Direct Stock Exchange (NYDSE) runs a Dutch Auction Forum that, they claim, is the only known existing market trading forum for DPO's (Direct Public Offerings), Private Placements and Restricted Stock.
  http://nydse.com
• The New York Mercantile Exchange lists contract specifications, charts, data, and a glossary of terms.
  http://www.nymex.com/
• The New York Stock Exchange offers information about the exchange and the companies listed there.
  http://www.nyse.com
• The Philadelphia Stock Exchange maintains a directory of sector index options and currency options.
  http://www.phlx.com/
• The Vancouver Stock Exchange offers a searchable directory of listed companies, quotes, etc.
  http://www.vse.ca
  

Exchanges in Europe

• The Athens Stock Exchange
  http://www.ase.gr
• Brussels Exchanges
  http://www.bxs.be
• The Geneva Stock Exchange
  http://www.bourse.ch
• The London International Financial Futures And Options Exchange (LIFFE) offers various information on-line.
  http://www.liffe.com/
• The London Stock Exchange
  http://www.londonstockexchange.com/
• The Madrid Stock Exchange
  http://www.bolsamadrid.es
• Information about the Milan Stock Exchange
  http://robot1.texnet.it/finanza
• Information about the Oslo Stock Exchange
  http://nettvik.no/finansen/kurser
• The Ljubljana Stock Exchange (Slovenia)
  http://www.ljse.is
• The futures and options exchange of Spain
  http://www.meff.es
• Information about the Vienna Stock Exchange
  http://apollo.wu-wien.ac.at/cgi-bin/boerse1.pl
• The Zagreb Stock Exchange
  http://www.zse.com.hr

Exchanges in Australia, Japan, New Zealand, and South-East Asia

• The Australian Stock Exchange
  http://www.asx.com.au
• Information about the Mumbai (was Bombay) Stock Exchange
  http://quark.kode.net/india
• The Hong Kong Futures Exchange
  http://www.hkfe.com
• The Korea Stock Exchange
  http://korea.directory.co.kr/daily/daily.html
• The Kuala Lumpur Stock Exchange (KLSE) in Malaysia
  http://www.investor.com.my
• Information about the Stock Exchange of Singapore
  http://www.livewire.ncb.gov.sg
• The Singapore International Monetary Exchange Ltd.
  http://www.simex.com.sg

Exchanges in the Middle East and Africa

• Information about the Egyptian Stock Exchange
  http://www.taqnya.com.eg/
• The South African Futures Exchange
  http://www.safex.co.za
• The Tel Aviv Stock Exchange
  http://www.tase.il

My apologies if the categories listed don't do justice to your home country. Please send me email with corrections.