What is "efax"

efax is an integrated fax program for Unix-like computer systems, produced by Casas Communications Engineering since 1993.

The software allows users to send and receive faxes using a computer, fax modem, and telephone line. It is command-line based, but there are several graphical user interfaces available.

efax is open-source and free software, licensed under the GPL. It is included in several major Linux distributions, including Debian, Red Hat, Mandriva, and others. There is also a BSD version, and it forms part of the Apple Mac OS X Darwin system.

efax may refer to:

• eFax, a commercial Internet fax service of j2 Global
• Internet fax, the transferral of fax information using the Internet
• efax (software), a computer based fax program for Unix-like computer systems
• Everett Efax file format, a file format