Implementations
There are three major implementations, Transarc (IBM), OpenAFS and Arla, although the Transarc software is losing support and is deprecated. AFS (version two) is also the predecessor of the Coda file system.
A fourth implementation exists in the Linux kernel source code since at least version 2.6.10. Committed by Red Hat, this is a fairly simple implementation still in its early stages of development and therefore incomplete.
Read more about this topic: Andrew File System