I need Java based charting software for a Unix machine. I don't mind paying a little money but I want to make sure it is the best java charting software before I invest in it. Thanks for the help.
I use thinkorswim for charting, it's a Java application and runs on pretty much anything although it's only officially supported on OS X and Windows. The free paper trading account has a 20 minute feed delay which may be adequate for your purposes, if not you can do what I did and move $5k worth of your low-risk portfolio into TOS to satisfy their account minimum.
http://www.prorealtime.com/en/ I don't know how good it is, but it is Java based. I think you can get it for free for EOD data which would give you an opportunity to evaluate.