Sumatra is another free PDF alternative for the Windows platform. Sumatra is also an open source project, so you can not only download the installation files, you can download the source as well.
Image credit to Jack Wallen for TechRepublic.
Jack Wallen is an award-winning writer for TechRepublic and Linux.com. He’s an avid promoter of open source and the voice of The Android Expert. For more news about Jack Wallen, visit his website getjackd.net.