FizzBuzz Enterprise Edition is a no-nonsense implementation of FizzBuzz made by serious businessmen for serious business purposes.

ANTLR (ANother Tool for Language Recognition) is a powerful parser generator for reading, processing, executing, or translating structured text or binary files.

Style and Grammar Checker for 25+ Languages

Apache Lucene open-source search software

This is mavenised Luke: Lucene Toolbox Project

Kuromoji is a self-contained and very easy to use Japanese morphological analyzer designed for search

A Japanese Tokenizer for Business

Carrot2: Text Clustering Algorithms and Applications

Universal HTAP Engine

RedPen is an open source proofreading tool to check if your technical documents meet the writing standard. RedPen supports various markup text formats (Markdown, Textile, AsciiDoc, Re:VIEW, reStruc…

A low-level integer compression library in Java

Pure Java implementation of XGBoost predictor for online prediction tasks.

Carrot2 plugin for ElasticSearch

Immutable key/value store with efficient space utilization and fast reads. They are ideal for the use-case of tables built by batch processes and shipped to multiple servers.

Japanese analysis for Apache Lucene/Solr

An ANTLR 4 grammar for PCRE

ZeroMQ centralized logging for log4j. ZMQAppender is now a separate project by @lusis

sa4j is a suffix array library