The Apache OpenNLP library is a machine learning based toolkit for the processing of natural language text. It supports the most common NLP tasks, such as language detection, tokenization, sentence segmentation, part-of-speech tagging, named entity extraction, chunking, parsing and coreference resolution. These tasks are usually required to build more advanced text processing services.^[2][3]

• Unstructured Information Management Architecture (UIMA)
• General Architecture for Text Engineering (GATE)
• cTAKES

• Apache OpenNLP Website