Mongo (from "humongous") is a high-performance, open source, schema-free, document-oriented database. It features: document data model with dynamic schemas; full, flexible index support and rich queries; auto-Sharding for horizontal scalability; built-in replication for high availability; text search; advanced security; aggregation Framework and MapReduce; large media storage with GridFS. This is an older version of mongodb, chosen to avoid the Server Side Public License and a need for a c++17 compiler.