If you can't download the file from the link above click here:
0.150.10
Usage:
Unpack JAR file from jbColumn.zip archive and put it
in <JBUILDER_HOME>\lib\ext directory.
Start JBuilder. You can go to editor settings dialog to adjust color and
for block text highlights. In the keymap customization window you should map actions
from "Column selection" category to the keys you want to use.