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Brill tagger   - a very fast POS tagger.
CST's Part-Of-Speech tagger (Brill, with adaptations)  
CyGreedy   - A super-fast POS tagger.
FACTORIE   - is a toolkit for deployable probabilistic modeling, implemented as a software library in Scala. It provides its users with a succinct language for creating relational factor graphs, estimating parameters and performing inference.
FANSE parser   - has a very good accuracy as a semantic role labeler.
FreeLing   - A comprehensive toolkit that includes tokenization, morphology, POS tagging, NER, and dependency parsing modules for various languages.
GATE Twitter POS tagger  
GENIA   - (POS) part-of-speech tagging, shallow parsing, and named entity recognition for biomedical text
HunPos   - an open source trigram tagger.
MedPost - part of speech tagger for the BIO domain  
MontyLingua   - A light-weight barebones NLP toolkit (lemmatization, POS-tagging, chunking, and basic semantic parsing)
NLP4j   - NLP tools from Emory university (a former ClearNLP and ClearParser)
Pattern   - is a web mining module for the Python programming language. It has tools for data mining (Google, Twitter and Wikipedia API, a web crawler, a HTML DOM parser), natural language processing (part-of-speech taggers, n-gram search, sentiment analysis, WordNet), machine learning (vector space model, clustering, SVM), network analysis and visualization.
SENNA   - Semantic Role Labeling (PropBank style), part of speech (POS) tagging, chunking, named entity recognition, syntactic parsing.
spaCy   - A fast but accurate POS tagger and dependency parser.
SVMTool   - an open source generator of sequential taggers.
TnT -- Statistical Part-of-Speech Tagging   - Highly efficient POS tagger for English and German.
Twitter POS