Update 2019-07-31 FALCOR is offline. I did try contacting the author through Twitter, but have received no response. Since people still seem to look at this post regularly, consider switching to the R package flan for fluctuation tests. There’s even a way to launch a FALCOR-style web app through Shiny (interactive websites powered by R), ShinyFlan. We will be using this package in future.
FALCOR (Fluctuation AnaLysis CalculatOR) is a handy Java applet designed to estimate mutation rates from fluctuation test data. A Java update prevents access to the clipboard to unsigned Java applets. If you are having trouble copy/pasting your data into FALCOR, try modifying your java.policy file to include the line: permission java.awt.AWTPermission “accessClipboard” under where it says //”standard” properties that can be read by anyone.
// "standard" properties that can be read by anyone permission java.awt.AWTPermission "accessClipboard"Save the file, exit and restart Java (or any programs using it, like Firefox or LibreOffice), and copy/paste should work again. You may wish to consider removing the clipboard access after using FALCOR for security reasons.
Danna Gifford 
Hello, I would like to use FALCOR, however there is no download buttom for the Software on the Website stated. Am I overlooking something? I cannot get a hold of the program anywhere…
Thank you
Hello, as far as I know FALCOR is an online Java applet only. I’m not aware of a way to download it, but you can use it online at this URL:
http://www.mitochondria.org/protocols/FALCOR.html
Hello, Thank you very much, my Company had deinstalled Java and therefore the Applet did not open for me, but now the Problem is solved!