MG4J (Managing Gigabytes for Java) is a collaborative effort aimed at providing a free Java implementation of inverted-index compression techniques; as a by-product, it offers several general-purpose optimised classes, including fast and compact mutable strings, bit-level I/O, fast unsynchronised buffered streams, (possibly signed) minimal perfect hashing, etc. MG4J functions as a full-fledged text-indexing system. It can analyze, index, and query consistently large document collections.

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License: GNU Lesser General Public License (LGPL)

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Changes:
This release has a new, high-performance index format, several optimizations, indices with arbitrary payloads (dates, integers, etc.), faster minimal perfect hashing, new operators, and better algorithms.