Sux4J is an effort to bring succinct data structures to Java. Presently it provides a number of related implementations covering ranking/selection over bit arrays, compressed lists and minimal perfect hashing.
Sux4J is distributed under the GNU Lesser General Public License.
Sux4J uses two packages providing high-performance containers and algorithms, that is, fastutil 5 or greater, and the COLT distribution. The DSI utilities provides efficient {@linkplain it.unimi.dsi.bits.BitVector bit vectors} and some useful I/O classes. Command-line parsing and support requires JSAP. All logging is performed using log4j.