GATE

http://gate.ac.uk/
Mailing list archive: http://gate-users-mailing-list-archive-read-only-no-new-topics-or-rep.1053641.n5.nabble.com/
pipeline processing (analysis engines)
rule-based modular IE system (ANNIE - ready-to-run GATE pipeline, with a sentence splitter, tokenizer, tagger, and gazetteer lookup for named entity recognition)
open and extensible architecture
comprising a set of core Processing Resources (PRs):

Tokeniser
Gazetteers
POS tagger
Sentence Splitter
Semantic Tagger (JAPE transducer)
Orthomatcher (orthographic coreference)
...

allows to use UIMA as a 'plugin'
good documentation + examples + GUI for linguistic annotations
corpus manager, text editor and debugger for JAPE results
no measurement for processing times
processing and linguistic resources available in distribution (CREOLE=modified Java beans)
IE plugin that uses Apache LUCENE
Plugins for:

GATE – Family

GATE Developer – an integrated development environment for language processing components bundled with the most widely used Information Extraction system and a comprehensive set of plugins
GATE Embedded – an object library optimized for inclusion in diverse apps
GATE Teamware – web app, a collaborative annotative environment
GATE Cloud – parallel distributed processingTuesday, November 29, 2011

GATE is free software under the GNU licences and others

Links:

Information extraction: http://gate.ac.uk/ie/

UIMA

Analysis engines (AE) - basic components used to analyze documents
Commnon Analysis Structure (CAS) - used to represent and share analysis results between Annotators

DKPro

http://code.google.com/p/dkpro-core-asl/
based on UIMA
offers many components, including:

tokenization/segmentation (BreakIterator, OpenNLP, LanguageTool)
compound splitting (Banana Split, JWordSplitter)
stemming (Snowball)
lemmatization (TreeTagger)
part-of-speech tagging (TreeTagger, OpenNLP)
language identification (TextCat)
spelling correction (Jazzy)
grammar checking (LanugageTool)
IO support for various data types (text, TEI, BNC-XML, XML, PDF, WSDL, Wikipedia, ...)
...

Licence: All components in DKPro Core ASL are licensed under the Apache Software License (ASL) version 2 - but their dependencies may not be.

Open NLP

http://opennlp.apache.org/
Wiki: http://sourceforge.net/apps/mediawiki/opennlp/index.php?title=Main_Page
Documentation: http://opennlp.apache.org/documentation/1.5.2-incubating/manual/opennlp.html
structure of open source projects related to NLP
OpenNLP tools use maximum entropy-based statistical language models.
can be run under UIMA as a plugin

tokenization
sentence segmentation
part-of-speech tagging
named entity extraction
chunking
full syntactic parsing
and coreference resolution

can use Ant to manage the pipeline and convert output to different format (http://www.ling.helsinki.fi/~gwilcock/Pubs/2009/Pipelines-GSCL-09.pdf)
Licence: Apache Software License (ASL) version 2.

Knime

http://tech.knime.org/
desktop app based on Eclipse / Java
100+ plugins available

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Forums, Opinions, Discussions

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[http://stackoverflow.com/questions/6603262/ease-of-use-stanford-corenlp-vs-opennlp]

Libraries you mention are rather old. Personally I don't see the use of OpenNLP nowadays. StanfordNLP software sometimes is used but mostly it is covered by libraries below.

What I would personally suggest to use and definitely advice to take a look at:

NLTK (Python)
Knime (Java + GUI for creating processing pipelines)
GATE (gate.ac.uk) (Java + also nice GUI for regular Text Mining)

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[http://www.ling.helsinki.fi/~gwilcock/Pubs/2009/Pipelines-GSCL-09.pdf]

An advantage of UIMA, that goes beyond thefacilities of previous approaches, is its use of atype system that deﬁnes annotation types and theirfeatures. This supports interoperability of components in a pipeline. Types are used to ensure that output from one component will be the right type for input to the next component in the pipeline.