Big Data

https://www.infoworld.com/article/2606657/open-source-software/119424-Bossie-Awards-2013-The-best-open-source-big-data-tools.html

Apache Hadoop

Apache Sqoop

Talend

Apache Hama

Cloudera Impala

Apache Drill

Gephi

Neo4j

MongoDB

Couchbase

Paradigm4 SciDB

Cassandra

Apache Spark

Apache TinkerPop/Gremlin (Apache TinkerPop and Gremlin are to graph databases what the JDBC and SQL are to relational databases)

Apache CloudStack (software that enables management/deployment of large numbers of nodes or virtual machines; basically, this is the back-end software used to run a cloud service provider)