1. Hadoop File System (HDFS): Clustered redundant file system for Hadoop
2. HBASE: Column oriented database scaling to billions of rows
3. MAPREDUCE: Parallel computation on cluster of servers
4. MAHOUT: Library of machine learning & data mining algorithms
5. HIVE: Datawarehouse with SQL like access
6. PIG: high level programming language for Hadoop
7. HCATALOG: Schema and datatype sharing over PIG, HIVE and MAPREDUCE
8. SQOOP: Imports data from relational databases
9. FLUME: Collection and import of log and event data
10. WHIRR: Cloud agnostic deployment of clusters
11. OOZIE: Orchestration and workflow management
12. AMBARI: Deployment configuration and Monitoring
13. ZOOKEEPER: Configuration Management and co-ordination.