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• PostgreSQL   - Sophisticated open-source Object-Relational DBMS supporting almost all SQL constructs, including subselects, transactions, and user-defined types and functions. Completely free database

• About.com on Postgres - Provides feature articles, net links, forum discussions and a chat room.
• Databases: As The Tables Turn - Tim Perdue article about porting sourceforge code from MySQL to PostreSQL.
• dbengine - A plug 'n play Web interface for PostgreSQL and Oracle.
• DreamCoder - GUI development environment that includes a debugger and a code generator. By Mentat Technologies. [Commercial]
• Embedding R in Postgres - The REmbeddedPostgres package allows you to embed the R interpreter in Postgres and use R functions as if they were built-in SQL functions.
• EnterpriseDB - A relational database management system based on PostgreSQL. It adds compatibility and performance features.
• Guide to Version 7.x Development and Configuration - A side by side comparison to Oracle 8i that can also be read as a stand alone document.
• Interactive SQL - GUI tool for creating SQL queries and managing PostgreSQL databases [commercial].
• MySQL PHP to PostgresSQL - A program that takes a php page that uses mysql calls and changes them into Postgres calls.
• Native PostgreSQL Frontend for Windows - Client applications for Windows including native SQL terminal and backup tools, psql and pg_dump, for executing SQL scripts and accessing PostgreSQL servers remotely.
• Navicat - This client tool enables users to manage multiple databases on local or remote servers easily. This is available for Windows and Mac OS X. (Important: this is not the tool from www.navicat.com)
• 2ndQuadrant - Training and support for development, tuning, and replication. Site includes course outlines, pricing, and schedules.
• NuSphere UltraSQL - NuSphere UltraSQL is a native Windows port of popular PostgreSQL database. [Commercial]
• OCaml - OCaml bindings that allow access to Postgres from the OCaml programming language. [Open Source, LGPL]
• Octave-pg - Octave modules to access PostgreSQL.
• Oracle v. Postgres - Forum discussion comparing Oracle and Postgres.
• Performance Tuning PostgreSQL - This article aims to help demystify PostgreSQL database performance tuning.
• PGAda - Provides a download of a module for Ada enabling access to the database system.
• PGCup - PGCup is a simple Java PostgreSQL administration tool. Currently under development and seeking volunteers. [Berkeley/BSD].
• PGExplorer - A GUI development tool for the Postgres Database Server is persented with screenshot, FAQ, download and costs. [Commercial].
• PhpPgAdmin - Feature list and downloads for a web-based administration tool.[Open Source, GPL]
• PL-J - A stored procedure platform that provides Java and other object oriented language integration.
• PostGIS: Geographic objects for PostgreSQL - Spatially enables the server, allowing it to be used as a backend spatial database for geographic information systems (GIS).
• Postgres on Redhat7.0 - Article from PHPBuilder on obtaining packages, installing and configuring.
• PostgresDAC - Borland Delphi/C++Builder component set for direct access to PostgreSQL without BDE or ODBC.
• PostgresPy Project - An open source software project dedicated to the continual improvement of the relationship between Python and PostgreSQL.
• PostgreSQL Autodoc - Automated creation of PostgreSQL documentation in Dia, Docbook, HTML, and GraphViz formats.
• PostgreSQL Forums - Forums for developers, administrators, and users of the PostgreSQL database.
• PostgreSQL Inc. - Commercial support for the object-relational database management system, PostgreSQL, as well as full database hosting.
• Postgresql Korean Users' Group - Official Homepage of PostgreSQL Korean Users' Group. This site contain documents, patches, user's profiles of PostgreSQL korean users.
• PostgreSQL Manager - Graphical tool for PostgreSQL administration and development.
• PostgreSQL Module for Python - Python module that embeds the PostgreSQL query library.
• PostgreSQL Technical Documentation - Contains community contributed documentation, CBT (Computer Based Training) tutorials, installation guides, technical guides, support contracts, lists of hosting providers, and additional resources.
• PsqlODBC - ODBC driver for Windows. Download, mailing list, documentation, and FAQs.
• pyPgSQL - A Python library for accessing PostgreSQL databases that conforms to the Python DB-API version 2.
• Recursive functions in PostGreSQL PGSQL - An example of how to display a recursive tree in pgsql.
• Red Hat Database - A version of Postgres that has been optimized for the Red Hat Linux distribution.
• A Review by Paragon Corporation - Article that focuses on features that make PostgreSQL different from most relational database management systems.
• Search PostgreSQL Sites - A searchengine for PostgreSQL-Documentation. Sample application for Tsearch2.
• Tsearch2 - Implementation of a new data type tsvector - a searchable data type with indexed access. Documentation and download.
• XPg: PostgreSQL GUI on Java - XPg is an object-oriented platform-neutral editor with a full featured graphical user interface that supports connections to multiple databases [Open Source : GPL].