TO UNINSTALL:

Use CleanApp. The "community" feature of CleanApp downloads a list of all the files other people have deleted when uninstalling NetBarrier, and CleanApp got everything on my system. When selecting files, don't just look for "Net*" in the path, also kill anything with "Intego".

CleanApp will move files to the Trash, but you still need to kill the processes using Activity Monitor. Some of them will restart each other. Kill these:

integod
WashingMachineHelper
NetUpdate*
NetBarrier*
TaskManagerDaemon

If you force quit all of these, you will be able to permanently the trashed files from NetBarrier.

Seriously, this is crapware that refuses to be uninstalled. If you're about to install it, don't. OS X firewall + Little Snitch is all that you need.