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DBUtils is a suite of tools providing solid, persistent and pooled connections to a database that can be used in all kinds of multi-threaded environments like Webware for Python or other web application servers. The suite supports DB-API 2 compliant database interfaces and the classic PyGreSQL interface.

dbtool can be used to store and retrieve data in a key/value format in a hash database. Perl compatible regular expressions are supported both for storing and retrieving of data. It's main advantages are the ability to maintain huge amounts of data and speed.

Cego is a Relational Database Management System (RDBMS). Cego supports transactional SQL query requests in a multithreaded architecture. For high availability requirements, Cego supports a database shadowing feature. Several compute nodes can be defined in a Cego database configuration, where each node is able to manage a number of so called table sets. For each tableset, a backup node can be defined, which runs is recover mode for the corresponding tableset. If required, the tableset can be switched to the backup node and this node gets the active node for the tableset. Many more details are available at:

GNU Data Access (GDA) is an attempt to provide uniform access to different kinds of data sources (databases, information servers, mail spools, etc). It is a complete architecture that provides all you need to access your data, defined by a set of CORBA interfaces as generic as possible (but very powerful at the same time) so that any kind of data source can be accessed through them. libgda is an interface to the GDA architecture, providing a nice wrapper around the CORBA interfaces, for both the client and the server parts. It also provides a bunch of tools to help you both in the development and management of your data sources, all done through the GDA model's set of CORBA interfaces. libgda was part of the GNOME-DB project, but has been separated from it to allow non-GNOME applications to be developed based on it.

GNU Data Access (GDA) is an attempt to provide uniform access to different kinds of data sources (databases, information servers, mail spools, etc). It is a complete architecture that provides all you need to access your data, defined by a set of CORBA interfaces as generic as possible (but very powerful at the same time) so that any kind of data source can be accessed through them. libgda is an interface to the GDA architecture, providing a nice wrapper around the CORBA interfaces, for both the client and the server parts. It also provides a bunch of tools to help you both in the development and management of your data sources, all done through the GDA model's set of CORBA interfaces. libgda was part of the GNOME-DB project, but has been separated from it to allow non-GNOME applications to be developed based on it.

Her is an ORM (Object Relational Mapper) that maps REST resources to Ruby objects. It is designed to build applications that are powered by a RESTful API instead of a database.

SQL Workbench/J is a free, DBMS-independent, cross-platform SQL query tool. It is written in Java and should run on any operating system that provides a Java Runtime Environment. Its main focus is on running SQL scripts (either interactively or as a batch) and export/import features. Graphical query building or more advanced DBA tasks are not the focus and are not planned.

Provide mathematical, string and aggregate functions for SQL queries using the SQLite loadable extensions mechanism. Math functions: acos, asin, atan, atn2, atan2, acosh, asinh, atanh, difference, degrees, radians, cos, sin, tan, cot, cosh, sinh, tanh, coth, exp, log, log10, power, sign, sqrt, square, ceil, floor, pi String functions: replicate, charindex, leftstr, rightstr, ltrim, rtrim, trim, replace, reverse, proper, padl, padr, padc, strfilter Aggregate functions: stdev, variance, mode, median, lower_quartile, upper_quartile

The Zild Database Library implements a small and fast database API with the following features: C database library - easy to use API - connect to multiple database systems - zero runtime configuration, connect using URL scheme - Thread safe Connection Pooling.

R.V. Guha's rdfDB. Intended to be a simple, scalable, open-source database for RDF. Written in C and based on top of the Sleepycat Berkeley Database, it supports interrogation via TCP/IP sockets, meaning integration is possible with any programming language. rdfDB uses a high level SQLish query language. The data is modelled as a directed labelled graph (RDF). The goals of this project are to build a database that is capable of: 1. Supporting a graph oriented API via a textual query language ala SQL. 2. Load/Reload an RDF file from a url into the database 3. Scalable to millions of nodes and triples. 4. Provide support for RDF Schemas. 5. Provide support for some basic forms of inferencing. 6. Provide both C and Perl access to the database. 7. The Perl philosophy applies : Simple things should be simple and complex things should be possible.