Download Mirrors
The current version of JFlex is available from the following locations:
Main site: http://www.jflex.de
UNSW Sydney: http://www.cse.unsw.edu.au/~kleing/jflex/
Sourceforge web page: http://jflex.sf.net
Sourceforge download system
There is also an archive of older JFlex versions (starting at version 1.3) at sourceforge.