CIO.com recently published its list of 9 open-source technologies to watch. Hadoop is first on the list, and second up is the R Project:
R is an open source programming language and software environment designed for statistical computing and visualization. R was designed by Ross Ihaka and Robert Gentleman at the University of Auckland, New Zealand beginning in 1993 and is rapidly becoming the go-to tool for statistical analysis of very large data sets. It has been commercialized by a company called Revolution Analytics, which is pursuing a services and support model inspired by Red Hat's support for Linux. R is available under the GNU General Public License.
Other big-data technologies on the list include Cascading, Cassandra, HBase and mongoDB.
CIO.com: 9 open-source technologies to watch
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Zero Inflated Models and Generalized Linear Mixed Models with R.
Zuur, Saveliev, Ieno (2012).