XFST is the Xerox Finite-State Tool, a command-line utility for performing simple finite-state operations and implementing simple finite-state networks in the form of a stack. We can use XFST to represent morphological structures and relations and perform operations on them such as union, concatenation, iteration, intersection, etc.
This is going to be a short blog series detailing how to use XFST to model simple morphologies by creating finite-state transducers.