The Helsinki Finite-State Transducer toolkit is intended for processing natural language morphologies. The toolkit is demonstrated by wide-coverage implementations of a number of languages of varying morphological complexity. HFST can be used via command line tools or a python API (documented in a separate wiki). We also offer ready-compiled morphological, hyphenation and spelling transducers and scripts (currently still hosted on Sourceforge). Also see our web demo.

• Command line tools: How to use HFST on command line

• Using weights: How to define weighted rules and transducers

• A quick start to command line tools

• Download and install HFST: Where to get HFST and how to install it

• Using HFST with OpenFst, foma and SFST backends

• Special symbols

• HFST python interface: Python bindings for HFST

• HFST ospell: Spell checking tool

• HFST optimized-lookup: Standalone utilities for optimized lookup

• HFST-related papers: Papers and publications related to HFST