H-Store is an experimental database management system (DBMS) designed for online transaction processing applications that is being developed by a team at Brown University, the Massachusetts Institute of Technology, and Yale University. The original design was developed in 2007 by database researchers Michael Stonebraker, Sam Madden, and Daniel Abadi. H-Store is highly optimized for three salient features of OLTP applications: H-Store is licensed under the BSD license and GPL licenses. The commercial version of H-Store's design is VoltDB.