You'll find POS tagging in the UIMA sandbox,
and there are any number of open source classifiers
out there. Coreference resolution and sentiment
analysis is another matter. I don't know of any
open source components for those, but maybe
someone else does.
The OpenNLP tools provide you with most of the tools you
need. It has sentence detector, tokenizer, pos tagger,
chunker, parser and coreference resolution.
It is licensed currently under LGPL, but this will be changed for the
next
major release to ASL to ease integration with apache projects.
You can find more information about it at the project website:
http://opennlp.sourceforge.net/
Jörn
