GridGain

http://www.gridgain.com/product.html

Overview

IN-MEMORY DATA GRID
COMPUTE GRID
ZERO DEPLOYMENT
SPI-BASED ARCHITECTURE
SCALE ON ANY IAAS OR PAAS
JAVA, SCALA, AND GROOVY
ADVANCED LOAD BALANCING
PLUGGABLE FAULT TOLERANCE
MANAGEMENT AND MONITORING
TESTIMONIALS
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GridGain 3.5.0
REAL TIME BIG DATA

GridGain is Java based open source middleware for real time big data processing and analytics that scales up from one server to thousands of machines.

Unlike complex, decade-old Hadoop ETL systems which use dead data for batch offline analytics, our platform allows companies to harness live data for smarter, faster real time analytics and processing.
GridGain is available as either free open-source Community Edition or commercial Enterprise Edition that packs even more features as well as enterprise grade support and maintenance. You can develop with GridGain using Java, Scala or Groovy programming languages - all of which are supported natively.

Click on the video below to learn more...

Direct link on YouTube.
Some of the most often used GridGain capabilities are:

WORK IN A ZERO-DEPLOYMENT MODE
SCALE UP OR DOWN BASED ON DEMAND
CACHE DISTRIBUTED DATA IN DATA GRID
CO-LOCATE DATA AND COMPUTATIONS
RUN SQL QUERIES AGAINST CACHED DATA
STORE AND QUERY JSON OBJECTS
SPEED UP TASK USING REAL-TIME MAP/REDUCE
USE DISTRIBUTED THREAD POOLS
DISTRIBUTE THE WORKLOAD ON THE GRID
EFFECTIVELY EXCHANGE MESSAGES
AUTO-DISCOVER ALL GRID RESOURCES
EXECUTE CLOSURES ON THE GRID
GRID-ENABLE JAVA, GROOVY AND SCALA
MORE INFORMATION

GridGain - White Paper
Compute and In-Memory Data Grids Integration - White Paper
Use Cases
Online Forums
Javadoc APIs
Online Book (under development)
Developers Wiki
Top Wiki