Yahoo! Stock Quotes

At Yahoo! Finance, you get free stock quotes, up to date news, portfolio management resources, international market data, message boards, and mortgage rates that help you manage your financial life.

Of special interest for webmasters is the Yahoo! CSV feeds that Yahoo! Finance offers. There are more scripts and tools available for webmasters interested in parsing and grabbing this feed.

PHP scripts

• Yahoo! Stock Quote Retriever - By Chief Programmabilities - The script goes to Yahoo! Finance to fetch stock quote data from a CSV file.
• Yahoo stock to RSS converter

Perl Scripts

• Finance::YahooQuote - a Perl module to retrieve stock (and other quotes) from Yahoo! Finance