ARtool - http://www.cs.umb.edu/~laur/ARtool/
ARtool contains several implementations of algorithms for mining frequent itemsets and association rules. ARtool and its sources are distributed freely under the GNU General Public License. The project is written in Java and consists of a user interface, a number of command line utilities, and a set of Java packages.
ARtool is based on revised versions of the core classes that I wrote for ARMiner, has a new user interface that provides more functionality, and includes a new algorithm for extracting the cover of association rules.
Contributed by: Laurentiu Cristofor (email@example.com)