Almost all Forex e-books are in .pdf format. You'll need Adobe Acrobat Reader to open these e-books. Some of the e-books (those that are in parts) are zipped.
A New Interpretation of Information Rate — by J. L. Kelly Jr.
Nicktrader and Jeff Explaining Reverse and Regular Divers — from Woodies CCI Club Discussion From January 15,16 2004.
The Sharpe Ratio — by William F. Sharpe.
The Interaction Between the Frequency of Market Quotes, Spread and Volatility in Forex — by Antonis A. Demos and Charles A. E. Goodhart, a scientific article from the Applied Economics.
Trend Determination — by John Hayden, a quick, accurate and effective methodology for trend determination on the financial markets.
Trend vs. No Trend — by Brian Dolan an article from TRADERS' Magazine July 2005 issue, which deals with the trend/no trend paradox encountered by many traders who think that "the trend is your friend".
Coder's Guru Full Course — by Coder's Guru — a full course on MQL development (programming for MetaTrader 4) that will help you develop your own custom indicators, trading scripts and automated expert advisors.