Hortonworks

Hortonworks was formed by the key architects and core Hadoop committers from the Yahoo! Hadoop software engineering team that led the effort to design and build every major release of Apache Hadoop from 0.1 to the most current stable release, contributing more than 80% of the code along the way. Their team continues to be the leading contributor to core Hadoop (MapReduce and HDFS) as well as many other important Hadoop projects.

Visit their website to learn more.