Can anyone recommend any free open source charting software? I won't be using it for trading, just for analysis. Thanks.
Check out the open source repositories. For instance do a "financial charting" search on sourceforge. http://sourceforge.net/softwaremap/trove_list.php
EclipseTrader (http://sourceforge.net/projects/eclipsetrader/) looks like your best bet. They need to implement better real-time charts and some more data feed plug-ins...but since it's open source you can do it yourself.