SQLite is a software library that implements a self-contained, serverless, zero-configuration, transactional SQL database engine. SQLite is the most widely deployed SQL database engine in the world. The source code for SQLite is in the public domain.
a community driven resource for open source software. Try starting a page about your favorite project, syndicating a blog for a topic, or browsing through tags people have added to projects or pages.
integrated data management application, competitor for products like Microsoft Access. It can be used for creating database schemas, inserting data, performing queries, and processing data. etc...
flexible template based code generator written in Microsoft.NET. Great at generating code for ORM architectures. The meta-data from your database is made available to the templates through the MyMeta API.
Drizzle is a community-driven open source project that is forked from the popular MySQL database. The Drizzle team has removed non-essential code, re-factored the remaining code and modernized the code base moving to C .
RefDB is a reference database and bibliography tool for SGML, XML, and LaTeX/BibTeX documents. It allows users to share databases over a network. It is accessible through command-line tools, through a web interface, from text editors (Emacs, Vim), and it contains a SRU server. Programmers can use Perl and PHP libraries to integrate RefDB functionality into their own projects. RefDB is released under the GNU General Public License and runs on Linux, the *BSDs, OS X, Solaris, and Windows/Cygwin.
What CouchDB is
* A document database server, accessible via a RESTful JSON API.
* Ad-hoc and schema-free with a flat address space.
* Distributed, featuring robust, incremental replication with bi-directional conflict detection and management.
* Query-able and index-able, featuring a table oriented reporting engine that uses Javascript as a query language.
What it is Not
* A relational database.
* A replacement for relational databases.
* An object-oriented database. Or more specifically, meant to function as a seamless persistence layer for an OO programming language.
eXist-db is an open source database management system entirely built on XML technology. It stores XML data according to the XML data model and features efficient, index-based XQuery processing.