Hue is an User Interface to connect and work with most of the commonly used Bigdata technologies like HDFS, Hive, Spark, Hbase, Sqoop, Impala, Pig, Oozie etc. Hue also supports running queries against Relational databases.
Hue, a django web application, was primarily built as a workbench for running Hive queries. Later the functionality of Hue increased to support different components of Hadoop Ecosystem. It is available as open source software under Apache License.