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ArangoDB (1.4.7)

Written in: C/C++
Main point: Multi-model flexible database for documents, graphs and key-values
License: Apache 2
Protocol: HTTP/REST

Master/slave replication
Querying support through declarative query language AQL based on JSONiq and XQuery
Extensible through JavaScript or built-in single page application framework Foxx
Runs on Windows, Linux, OSX and even Raspberry Pi
Supports for transactions and graph traversals
MVCC - write operations do not block reads
Web based database administration interface with graph visualization

Best used: If your data model requires support for documents, graphs, key-values and flexible querying. No language zoo: you can use one language from your browser to your backend.

For example: CMS, CRM, recommendations systems, REST API backend without middleware.