15 Million Games Chess Database

I maintain a chess games database, at the time of writing this post database contains 15 million games
and growing.
You can contribute your efforts or download here
Check for database updates on above link from time to time.

Forex calculator

Here is simple calculator for forex traders, to simplify and quickly compute lot size according to desired amount of risk and market activity.

It's Excel 2010 spreadsheet and depends on metatrader 4 DDE server to update live quotes into the book itself, so you don't have to worry about much typing.
Calculating is easy once you acquire all information needed for input.

The book contains help page to quickly introduce you how to do setup and use it.

Download here

2nd improved version of the book has been uploaded 12/31/2014