SentencePiecegoogle/sentencepiece
A C++ library for unsupervised text tokenization and detokenization, widely used in modern NLP models.

proycon/colibri-core
C++ library, command line tools, and Python binding for extracting and working with basic linguistic constructions such as n-grams and skipgrams in a quick and memory-efficient way.
A C++ library for unsupervised text tokenization and detokenization, widely used in modern NLP models.
C, C++, and Python tools for named entity recognition and relation extraction
MeTA : ModErn Text Analysis is a C++ Data Sciences Toolkit that facilitates mining big text data.
CRFsuite is an implementation of Conditional Random Fields (CRFs) for labeling sequential data.
Open source implementation of Conditional Random Fields (CRFs) for segmenting/labeling sequential data & other Natural Language Processing tasks.
BLLIP Natural Language Parser (also known as the Charniak-Johnson parser).
Memory-based NLP suite developed for Dutch: PoS tagger, lemmatiser, dependency parser, NER, shallow parser, morphological analyzer.
Unicode-aware regular-expression based tokenizer for various languages. Tool and C++ library. Supports FoLiA format.