Resources and Tools for Text Representation and Visualization:

• Online Registry of Biomedical Informatics Tools (ORBIT) Project is a community-wide effort to create and maintain a structured, searchable metadata registry for informatics software, knowledge bases, data sets and design resources. http://orbit.nlm.nih.gov/
• NaCTeM - National Centre for Text Mining (http://www.nactem.ac.uk/services.php)
  develops and offers several tools for text processing, including TerMine, AcroMine, Cheshire/TerMine, and U-Compare (http://u-compare.org/).
• Open Text Mining Interface
• Visualcomplextiy
  maintains a diverse collection of projects that visualize complex networks.
• Gender Genie
  uses a simplified version of an algorithm developed by Moshe Koppel, Bar-Ilan University in Israel, and Shlomo Argamon, Illinois Institute of Technology, to predict the gender of an author.
• Termino
  marks up text by identifying a variety of different types of biomedical terms that can be linked to databases like the UMLS and Gene Ontology via unique ids.
• Corpora for biomedical natural language processing
• ACL Wiki
  This is the main page of the ACL Wiki for Computational Linguistics, a wiki that is running under the auspices of The Association for Computational Linguistics.
• Martin Krallinger - Biology and Text Mining related links
  An NLP-oriented compendium of tools, resources, groups, evaluations, etc.
• Martin Krallinger - BioNLP resources
• FetchProt Corpus
  tagged full-text articles describing experiments on proteins to validate tyrosine kinase.
• TextArc
  just for fun!
• Benchmarks and Corpora for BioNLP
  annotated evaluation data sets for various IR/IE/TM tasks
• NLP registry
  natural language processing software.
• BioNLP.org
  natural language processing of biology text.
• LingPipe
  a suite of Java tools designed to perform linguistic analysis on natural language data.
• Information Visualization Software Repository
  for visualizing knowledge domains.
• WordNet
  a lexical database for the English language - nouns, verbs, adjectives, and adverbs organized into synonym sets.
• BLIMP
  a forum for collection, compilation and exchange of publications on biomedical text mining.
• GATE open source software for text processing - includes wrappers for ABNER, MetaMap, AbGene, GENIA sentence splitters and taggers, Penn BioTagger, MutationFinder, NormaGene and LingPipe, among others. 
• BioEnEx - a bio-entity mention recognition system that can annotate multiple biomedical semantic types with high performance. http://fmchowdhury.googlepages.com/bioenex.