1. Frameworks
   1. Cascade
   2. Google's FlumeJava
   3. Crunch (similar to Google's FlumeJava)
   4. Pig
   5. Hive
   6. Spring Framework
2. Alternatives/Variations
   1. Storm by Twitter (realtime computations)
   2. Spark (in memory materializing and reusing intermediate results)
   3. DataStax Enterprise (Cassandra instead of HDFS)
   4. Apache Hama (BSP framework on top of HDFS)
   5. Apache Giraph (graph processing)
3. Deployment Tools
   1. Apache Whirr
   2. VmWare Serengeti
   3. Cloudera Manager
   4. Apache Mesos
   5. Apache Ambari (by Hortonworks)
4. Distributions
   1. Cloudera
   2. Hortonworks
   3. MapR
5. Biggest Contributors/Users
   1. Yahoo!
   2. Facebook
   3. Hortonworks
   4. Cloudera
6. IDE
   1. Spring IDE
7. Web Services
   1. Amazon Elastic MapReduce