On DriveThruRPG, Hunters Entertainment has a $0.00 offering called "Hunters Entertainment - Free Content Friday!" and on the first Friday of the month, it gets bigger.
There are now eight different downloads in the package. The Outbreak: Undead, Icarus and Teens in Space January offerings are still there.
So, bookmark the page and revisit every Friday for free Hunters Entertainment goodies.
... and who are the scary monsters?