The source code, binary versions for Windows/Linux/Mac, documentation, examples, and other files are available here. If you have a username and password for FEFF on the World Wide Web, click the appropriate link below. Please note that the passwords for downloading FEFF7, FEFF8 and FEFF9 are not the same. If you wish to upgrade to a newer version, you need to purchase an upgrade. Upgrades and new licenses may be purchased on our ordering page.
Download the free FEFF6-lite, limited to EXAFS analysis
Download the free FEFF8-lite, limited to EXAFS analysis
To obtain earlier versions of FEFF, please contact the FEFF administrator.