Click Forensics, Inc.
Technologies: Hadoop, Hive, HBase, Mahout
Application: Data mining and machine learning with very large online advertising data sets
IBM
Technologies: Hadoop, Cassandra, Zookeeper, Hive, Pig
InfoChimps
Technologies: Hadoop, Cassandra, Pig, WuKong
Pervasive Software
Technologies: Pervasive DataRush, Hadoop, Pig and Hive
Potomac Fusion - Hiring!
Technologies: Hadoop, Zookeeper, Map/Reduce, HBase
RackSpace
Technologies: Apache Cassandra and Hadoop
Riptano
Technologies: Apache Cassandra Committers and PMC Lead. Provide their own Cassandra distribution and services.