Popcompanion is a desktop application that runs minimized and in the background for sending and receiving faxes through www.popfax.com API. It is another window to your Popfax.com account and it is designed to run on Linux, OSX and Windows.
Popfax printer driver is a module used to convert documents from various file formats to black and white TIFF FAX G3 format and forward them to any fax machine via Popfax.com Internet fax services.