Several resources specialized to medical domain are available.
Toolkits and Libraries
Apache cTakes (clinical Text Analysis Knowledge Extraction System): cTakes is a natural language processing system for extraction of information from electronic medical record clinical free-text.
MetaMap: An application to map biomedical text to the UMLS Metathesaurus or, equivalently, to discover Metathesaurus concepts referred to in text. MetaMap uses a knowledge-intensive approach based on symbolic, natural-language processing (NLP) and computational-linguistic techniques. Besides being applied for both IR and data-mining applications, MetaMap is one of the foundations of NLM's Medical Text Indexer (MTI) which is being used for both semiautomatic and fully automatic indexing of biomedical literature at NLM.
CLAMP (Clinical Language Annotation, Modeling and Processing Toolkit) : A comprehensive set of tools combined with a graphical user interface to visually develop natural language processing projects.
OHNLP (Open Health Natural Language Processing Consortium)
General Domain
GATE (General Architecture for Text Engineering)
Apache UIMA (Unstructured Information Management Architecture)
Apache OpenNLP
NLTK (Natural Language Toolkit)
Stanford CoreNLP Suite
Apache Lucene: A search engine library forms the basis of Elasticsearch and Apache Solr Applications
Knowledge Resources
UMLS (Unified Medical Language System): A comprehensive knowledgebase for medical terminologies.
Shared Annotated Resources (ShARe) project
SPECIALIST NLP Tools
MT Samples: 5000 clinical notes for developing and testing NLP models.
General Domain
"NLP"
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