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.
MetaBoss is an integrated suite of tools for the design, development, and management of enterprise software systems through modelling. It utilises OMG's Model Driven Architecture concepts and is primarily oriented at enterprises using Java based tools and technologies. It encourages serious upfront analysis and design and aims to crystallise the value of it by automating a number of activities in the Software Development Life Cycle.
RSP is a retargetable language for writing portable Web applications. Web applications can be written once in RSP and then compiled, using the RSP compiler, to either ASP, JSP or PHP. The RSP language is syntactically similar to Java/JSP. It is strongly typed and pseudo object orientated. Its standard library contains functions and objects for common Web programming tasks and database abstraction.
Druidedb is a simple XML file database API in Java to manage an XML database file system without database complexity (no server or client, and stores only strings). This API creates both the access DAO sources files and the DB filesystem. It can handle auto-increments and primary keys.
C++ ResourcePool is a library which can be used to pool resources of every kind. It can also be used as an abstraction layer by providing a unique API for different resources of similar resource types; the most prominent examples are SQL databases. It includes a convenient way to access MySQL and Oracle databases in the same way, so that changing from MySQL to Oracle or vice-versa does not need big code changes.