- LS-POS, from the university of Edinburgh [UK], GNU License, English language. [pdf]
- TreeTagger, from the university of Stuttgart [DE], for English, German, Italian, Spanish, French and old French, implemented in C, Windows interface available, Python wrapper. [pdf]
- Log-linear Tagger, from the university of Stanford [US], GNU License, Java API, English language.
Tags: machine learning, statistics, tagging, text data mining