SymmetricDS is a database and file synchronization solution that is platform-independent, web-enabled, and database agnostic. SymmetricDS was built to make data replication across two to tens of thousands of databases and file systems fast, easy and resilient. It supports near real time, bi-directional data replication across large node networks over the WAN or LAN.

SymmetricDS - Multi Database Replication

Tungsten Replicator is a high performance, data replication engine for MySQL. It offers a set of features like Global transaction IDs to support failover, Flexible transaction filtering, Extensible transaction metadata, Sharding, Multiple replication services per process and lot more. Tungsten Replicator prompts masters easily from pools of slaves, Replicates data between different database versions, Replicating efficiently across sites, Building complex topologies, and Parallelizing data flow between servers. Tungsten Replicator runs equally well in cloud as well as locally hosted environments.

Tungsten Replicator is a high performance, data replication engine for MySQL. It offers a set of features like Global transaction IDs to support failover, Flexible transaction filtering, Extensible transaction metadata, Sharding, Multiple replication services per process and lot more.

Tungsten Replicator - Data Replication Engine for MySQL

Perst is McObject's open source, dual license, object-oriented embedded database system (ODBMS). Perst gives developers the ability to sort, store and retrieve objects in their applications with maximum speed and with low memory and storage overhead, while leveraging the object-oriented paradigm of Java and C#. It is available in one edition developed as an all-Java embedded database, and another implemented in C# (for Microsoft .NET Framework applications). Perst’s also include garbage collection, schema evolution, a “wrapper” that provides a SQL-like database interface (SubSQL), XML import/export, database replication, support for large databases, and more.

Perst is McObject's open source, dual license, object-oriented embedded database system (ODBMS). Perst gives developers the ability to sort, store and retrieve objects in their applications with maximum speed and with low memory and storage overhead, while leveraging the object-oriented paradigm of Java and C#. It is available in one edition developed as an all-Java embedded database, and another implemented in C# (for Microsoft .NET Framework applications).

Perst - object-oriented embedded database

BookKeeper is a replicated log service which can be used to build replicated state machines. A log contains a sequence of events which can be applied to a state machine. BookKeeper guarantees that each replica state machine will see all the same entries, in the same order. It provides back end support to distributed systems, such as messaging systems, coordination systems, filesystems, etc.

BookKeeper - Replicated Log Service

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.

db4o

Copycat is a fault-tolerant state machine replication framework. Built on the Raft consensus algorithm, it handles replication and persistence and enforces strict ordering of inputs and outputs, allowing developers to focus on single-threaded application logic. Its event-driven model allows for efficient client communication with replicated state machines, from simple key-value stores to wait-free locks and leader elections. You supply the state machine and Copycat takes care of the rest, making it easy to build robust, safe distributed systems.


Copycat - A novel implementation of the Raft consensus algorithm

DBTransfer is a multi-platform java tool, that aims to replicate one database (JDBC or MS Access) to another (JDBC), using an one to one conversion. 
Its features include: 
<ul>
<li>Copy data from one database type to another type. Example: you can
migrate your MSSQL to PostgreSQL, without losing the structure,
including not only the original schema, the constraints, and of course,
the data it self, which is converted to respective data-type.</li>
<li>Copy one database schema to another.</li>
<li>Move data from one database to another.</li>
<li>Compare two databases.</li>
</ul>

DBTransfer is a multi-platform java tool, that aims to replicate one database (JDBC or MS Access) to another (JDBC), using an one to one conversion.

DBTransfer - Versatile and fast database transfer tool

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SymmetricDS - Multi Database Replication

Tungsten Replicator - Data Replication Engine for MySQL

Perst - object-oriented embedded database

BookKeeper - Replicated Log Service

db4o

Copycat - A novel implementation of the Raft consensus algorithm

DBTransfer - Versatile and fast database transfer tool

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Projects

SymmetricDS - Multi Database Replication

Tungsten Replicator - Data Replication Engine for MySQL

Perst - object-oriented embedded database

BookKeeper - Replicated Log Service

db4o

Copycat - A novel implementation of the Raft consensus algorithm

DBTransfer - Versatile and fast database transfer tool

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