Hadoop

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