General Data Tagger
- Perl code in text format from Kristie Seymore. Brief notes.
- http://www.cs.cmu.edu/~kseymore/general_tagger.pl

TnT: Trigrams 'n Tags
- Statistical part-of-speech tagger trainable on different languages and tagsets. Trained and trainable versions. Online demo, noncommercial licensing information, documentation.
- http://www.coli.uni-saarland.de/~thorsten/tnt/

Machinese Phase Tagger
- Online demo of this constraint grammar-based tagger for English, French, Spanish, German, Dutch, Italian and Finnish,
- http://www.connexor.com/demo/

QTAG
- Downloadable Java-powered tagger, from the University of Birmingham.
- http://www.english.bham.ac.uk/staff/omason/software/qtag.html

Memory-Based Tagger Demo
- Online tagging of Dutch, Spanish, English, Slovene, Swedish and German text. Extensive list of related research.
- http://ilk.uvt.nl/~zavrel/tagtest.html

Lingsoft's morphological analyzers
- Two-level morphological analyzers for English, German, Swedish, Finnish, Danish, and both forms of Norwegian. On-line demos and licensing information.
- http://www.lingsoft.fi/demos.html

Eric Brill's Home Page
- Personal page of this computer scientist, including a download of the groundbreaking "Brill tagger." Source code from 1996, part Perl, part C.
- http://www.cs.jhu.edu/~brill/

Infogistics Parser/Chunker
- Online demo of a system that tags and chunks English into phrases. Freely downloadable for research purposes.
- http://www.infogistics.com/posdemo.htm

Monty Tagger: A Brill-Based Part-of-Speech Tagger
- Portable tagger with implementations in Python and Java, based on Eric Brill's 1994 tagger. Background and license information, downloads.
- http://web.media.mit.edu/~hugo/montytagger/

AUTASYS - A Fully Automatic English Wordclass Analysis System
- A Windows 95/98 compatible tagger developed by Alex Chengyu Fang. Tagsets, samples, documentation.
- http://www.phon.ucl.ac.uk/home/alex/project/tagging/tagging.htm

TreeTagger
- A language independent part-of-speech tagger, available in versions adapted to German and to English. Documentation, downloads, license information, demos.
- http://www.ims.uni-stuttgart.de/projekte/corplex/TreeTagger/DecisionTreeTagger.html

CLAWS Tagger
- From the UCREL corpus annotation project. Documentation, free online trial, licensing information.
- http://www.comp.lancs.ac.uk/computing/research/ucrel/claws/