CoreNLP: A Java suite of core NLP tools for tokenization, sentence segmentation, NER, parsing, coreference, sentiment analysis, etc.

Hipster4j is a lightweight and powerful heuristic search library for Java and Android. It contains common, fully customizable algorithms such as Dijkstra, A* (A-Star), DFS, BFS, Bellman-Ford and more.

Unsupervised Statistical Machine Translation

NLP tools developed by Emory University.

IXA pipes Part of Speech tagger and Lemmatizer (http://ixa2.si.ehu.es/ixa-pipes)

Efficient Execution of Perl Scripts on Hadoop Clusters