The code will be written in Java because I know Java the best. It will be open source and published on Github, but not yet as it is not completely finished. There will also be a website that has the java applet on the webpage for anyone to calculate the price of any Bitcointalk Account.
I wouldn't use an applet for trust reasons. I wouldn't trust a random unsigned applet, even from a potentially trustworthy user. You should see if you can get PHP, a servlet container, or JSP on your website to run it on the website's side. Alternatively, use Javascript which is a bit easier to trust on a webpage (I can try to help with that)
I will look into those. Thanks for the info.