Neo4j is a high-performance graph engine with all the features of a mature and robust database. It is a graph database, storing data in the nodes and relationships of a graph. It includes the usual database features like ACID transactions, durable persistence, concurrency control, transaction recovery, high availability. It is massively scalable to handle graphs of several billion nodes on a single machine. It has a powerful traversal framework for high-speed traversals in the node space. It can be deployed as a full server or a very slim database embedded database. 
Neo4j's high-performance distributed cluster architecture scales with your data needs, minimizing cost and hardware while maximizing performance across connected datasets. Neo4j enforces rigorous enterprise security rules while remaining easy to deploy and manage. Protections like “row-level” security in relational databases are not enough when using graphs. Organizations need fine-grained access control for mission-critical security and privacy.

Neo4j is a high-performance graph engine with all the features of a mature and robust database. It is a graph database, storing data in the nodes and relationships of a graph. It includes the usual database features like ACID transactions, durable persistence, concurrency control, transaction recovery, high availability.

Neo4j - Graph Database

TypeDB is a strongly-typed database with a rich and logical type system. TypeDB empowers you to tackle complex problems, and TypeQL is its query language. TypeDB allows you to model your domain based on logical and object-oriented principles. Composed of entity, relationship, and attribute types, as well as type hierarchies, roles, and rules, TypeDB allows you to think higher-level as opposed to join-tables, columns, documents, vertices, edges, and properties.
 
TypeDB allows you to model your domain using the well-known Entity-Relationship model. It is composed of entity types, relation types, and attribute types, with the introduction of role types. TypeDB allows you to leverage the full expressivity of the ER model, and describe your schema through first normal form.
 
Types provide a way to describe the logical structures of your data, allowing TypeDB to validate that your code inserts and queries data correctly. Query validation goes beyond static type-checking, and includes logical validation of meaningless queries. With strict type-checking errors, you have a dataset that you can trust.
 
TypeDB encodes your data for logical interpretation by a reasoning engine. It enables type-inference and rule-inference, which create logical abstractions of data. This allows the discovery of facts and patterns that would otherwise be too hard to find; and complex queries become much simpler.
 
TypeDB's API is provided through a gRPC client, providing bi-directional streaming, compression, and strong message typing, that REST APIs could not provide. TypeDB Clients are delivered as libraries in dedicated languages that provide stateful objects, Session and Transactions, for you to interact with the database programmatically.

TypeDB is a strongly-typed database with a rich and logical type system. TypeDB empowers you to tackle complex problems, and TypeQL is its query language. TypeDB allows you to model your domain based on logical and object-oriented principles. Composed of entity, relationship, and attribute types, as well as type hierarchies, roles, and rules, TypeDB allows you to think higher-level as opposed to join-tables, columns, documents, vertices, edges, and properties.

TypeDB - A strongly-typed database

LucidDB is the RDBMS built entirely for data warehousing and business intelligence. It is based on architectural cornerstones such as column-store, bitmap indexing, hash join/aggregation, and page-level multiversioning. Every component of LucidDB was designed with the requirements of flexible, high-performance data integration and sophisticated query processing in mind. 

 Rather than throwing hardware at data warehousing problems by relying on expensive clusters or specialized "appliances", the scalability offered by LucidDB's unique architecture allows you to achieve great performance using only a single off-the-shelf Linux or Windows server. Besides keeping costs down, this also minimizes maintenance and administration hassles. 
 <UL>
	<LI>Support of both 32 and 64 bit platforms</LI>
	<LI>Integrated with Pentaho Business Intelligence product</LI>
	<LI>Automatically adapts to either bitmap or btree representation depending on data distribution</LI>
	<LI>Versioning at page-level is much more efficient than transactional databases</LI>
	<LI>Supports incremental backup</LI>
	<LI>High performance and greater cache and disk effectiveness</LI>
	<LI>Allows flat files (e.g. BCP or CSV format) to be queried as foreign tables via LucidDB</LI>
 </UL>

LucidDB is the RDBMS built entirely for data warehousing and business intelligence. It is based on architectural cornerstones such as column-store, bitmap indexing, hash join/aggregation, and page-level multi versioning. Every component of LucidDB was designed with the requirements of flexible, high-performance data integration and sophisticated query processing in mind.

LucidDB - RDBMS built entirely for Data Warehousing and Business Intelligence

db4o open source object database, native to Java and .NET. Its power comes from allowing arbitrarily complex, application defined, class models to also represent your database schema. 
	
 <UL>
	<LI>Support for Mobile</LI> 
	<LI>First embedded DB to support LINQ</LI>
	<LI>Full support for Compact Framework plus Sync capabilities</LI>
	<LI>Compatible with ADO.NET DataServices API</LI>
	<LI>Object persistence out-of-the-box</LI> 
	<LI>Free Object Manager plugin for DB exploration (OME)</LI> 
	<LI>No schema mapping complexity</LI>
	<LI>Zero Administration</LI>
	<LI>Replication</LI>
	<LI>Embeddable</LI>
	<LI>Native Queries</LI>
 </UL>

db4o open source object database, native to Java and .NET.

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Neo4j - Graph Database

TypeDB - A strongly-typed database

LucidDB - RDBMS built entirely for Data Warehousing and Business Intelligence

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Neo4j - Graph Database

TypeDB - A strongly-typed database

LucidDB - RDBMS built entirely for Data Warehousing and Business Intelligence

db4o

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License