I invite you to take a look at: http://www.iqfront.com/portfoliotool.php

You can create professional portfolio reports, perform Markowitz type mean-variance portfolio optimization and conduct sensitivity analyses. The service is genuinely free of charge; it is funded by advertisement income. The security data is free EOD, and it covers the US stock markets as well as the major ones in Europe, Asia, South America and Australia.

There is a brief tutorial document available here: http://www.iqfront.com/whitepapers.html

I should probably point out that this service is not a trading tool - it can be regarded as an alternative for Excel for keeping track of (even large) equity portfolios. The nice thing about it is that the data is always up to date, you don't have to download it.

Are you the owner of iqfront?? The site looks professional how long has it been around??