Replication

DBBalance
Offers a solution for comparing, synchronizing, replicating and converting data and database structure between ODBC enabled databases. Trial downloads, ordering information and online documentation.
http://www.dbbalance.com/

DBMoto
Provides real-time data replication and data integration using snapshot, incremental and synchronization replication. Datasheets, knowledge base, frequently asked questions and customer portal.
http://www.hitsw.com/products_services/dbmoto/dbmoto.html

DBReplicator
An open-source Java application for network-based multi-master heterogeneous database replication or filtered synchronization. Documentation, forums, downloads and news.
http://dbreplicator.org/

Escada
Provides a full range of database replication options across a multiple database management systems. Downloads, documentation and support.
http://escada.sourceforge.net/

FiBRE
Free replication tools for the FireBird database. Online manuals and source code documentation.
http://fibre.sourceforge.net/

High Volume Replicator
Replication tool designed for a high volume of data. Whitepapers, partner pages, customer listing, news and free trial download.
http://www.hvr.biz/

Multi-Master Replication Challenges
Describes the difficulties encountered in a mult-master replication scenario from an Oracle point of view.
http://www.dbspecialists.com/presentations/mm_replication.html

Multi-master Replication Overview
Describing methods of replication, including details of implementations in popular databases and middleware solutions.
http://en.wikipedia.org/wiki/Multi-master_replication

Pervasive DataExchange
Offers targeted solutions to data movement and synchronization problems like real-time backup and data synchronization. Datasheets, documentation, support and trial downloads.
http://ww2.pervasive.com/Database/Products/DataExchange/Pages/DataExchangeOverview.aspx

Pgpool-II
A middleware that works between PostgreSQL servers and a PostgreSQL database client and provides connection pooling, replication, load balancing and parallel queries. Online installation instructions and documentation.
http://pgpool.projects.postgresql.org/

Postgres-R
Postgres-R is an extension to the relational database system PostgreSQL providing efficient, fast and consistent database replication.
http://www.postgres-r.org/

Progress Software
DataXtend RE, a data replication tool for online and offline use. Support and ordering information as well as whitepapers and other documentation.
http://www.progress.com/dataxtend/dataxtend_re/index.ssp

Replication, The Next Generation of Distributed Database Technology
Lengthy article on database replication technology covering different vendor approaches and difficulties involved.
http://www.dciexpo.com/geos/replica.htm

Shadowbase Products
Software for uni-directional and bi-directional database replication between homogeneous or heterogeneous databases. Supports data transformation and flexible mapping. Sales literature, contact and evaluation information.
http://www.gravic.com/shadowbase/products/overview.html

SymmetricDS
Web-enabled, database independent, data synchronization/replication software. Overview, documentation and downloads.
http://symmetricds.sourceforge.net/

Middleware-based Database Replication: The Gaps Between Theory and Practice
Academic paper describing database replication models, challenges, performance issues and scenarios in practice. [PDF] <small>(2008-06-12)</small>
http://infoscience.epfl.ch/record/118488/files/fp462-cecchet.pdf?version=1

Database Replication
DBMS Magazine article by Charles Thompson comparing three leading DBMS vendors' approaches to replication. <small>(May, 1997)</small>
http://www.dbmsmag.com/9705d15.html