DB2 is a database management system that offers industry leading performance, scalability, and reliability on your choice of platform from Linux to z/OS. Its Web Control Center offers administrators an easy-to-use interface for maintaining databases, and can be run from any Java-enabled Web browser. For Java developers, DB2 UDB for Linux offers support for JDBC and SQLJ, and Net.Data allows for the creation of dynamic data diven Web applications. DB2 UDB for Linux allows you to harness the power of user-defined types and functions and support for Binary Large Objects.
SQL Construction Kit aims to provide a simple builder/factory pattern based approach to generating DML SQL for all popular RDBMS systems. Included builders are SelectBuilder, InsertBuilder, UpdateBuilder, and DeleteBuilder. It is much lighter weight than any of the ORM tools available, and is 100% Java. It is a complete re-factoring of code that has been in production use since 2001 (updated to use features of Java 6). Also included is a Facade patterned Database object that wraps a Datasource object. This provides an execution framework for the results of the Builder objects, which includes simplified transaction and batch management as well as the ability to transparently handle SQL exceptions in a default manner. The Database object also provides a simple object-oriented approach via wrappers around the database metadata.
db4o is an object database for Java and all .NET environments. Its features include ACID transactions, automatic class schema recognition, query-by-example, a S.O.D.A. object querying API, native queries, LINQ support on .NET, callback methods, memory files, cascade-on-delete, multi-threaded access, and Java Webstart and servlet support.
Berkeley DB Java Edition is a high performance transactional storage engine written entirely in Java. Like the highly successful Berkeley DB product, it executes in the address space of the application without the overhead of client/server communication. It stores data in the application's native format, so no runtime data translation is required. It supports full ACID transactions and recovery, and provides an easy-to-use interface, allowing programmers to store and retrieve information quickly, simply, and reliably.
Berkeley DB XML is a native XML database engine for use within your product. Made available as a C++ library with language bindings for Java, Perl, Python, PHP, and Tcl, it integrates directly into your application (it is not a standalone database server). It provides XQuery access into a database of document containers. XML documents are stored and indexed in their native format using Berkeley DB as the transactional database engine.
HailDB is a relational database in shared library form that can be embedded into applications. It is not a SQL database, although you can use this library as the storage backend for a SQL database. It features a clean and simple API and is a continuation of the Embedded InnoDB project. With the addition of the HailDB plugin to Drizzle, you get a full SQL interface.
SQLite is a small, fast, embeddable SQL database engine that supports most of SQL92, including transactions with atomic commit and rollback, subqueries, compound queries, triggers, and views. A complete database is stored in a single cross-platform disk file. The native C/C++ API is simple and easy to use. Bindings for other languages are also available.