OpenLink Virtuoso is a scalable, high-performance SQL-200n compliant object-relational database engine. It provide sophisticated database management for SQL, XML, and RDF. All interaction with Virtuoso occurs via its support of industry standard query languages, protocols, APIs, and data formats such as: ODBC, JDBC, OLE-DB, ADO.NET, XMLA, SQL, SPARQL, XQuery, SOAP, HTTP, WebDAV, SyncML, Atom (Publishing and Syndication), RSS, RDF, and more.
Kodo JDO allows you to write database calls using Java statements instead of SQL statements, by supporting the Java Data Objects standard for transparent persistence. It is the most complete implementation of the JDO specification for relational data stores, and comes with tools for producing a schema from an object model, producing class files from an existing schema, and a performance pack (distributed caching and statement batching) that improves performance by 15 - 30 times. It supports most relational databases, application servers, and IDEs, and reduces the total coding effort by 20-40%.
KInterbasDB is a Python extension package that implements Python Database API 2.0-compliant support for the open source relational database Firebird and some versions of its proprietary cousin Borland Interbase. In addition to the minimal feature set of the standard Python DB API, KInterbasDB also exposes nearly the entire native client API of the database engine.
Daffodil DB is a SQL-99 specification compliant, lightweight, Java-based relational database engine (RDBMS). It supports almost all constructs of SQL 99 (including triggers, views, constraints, UDT, stored procedures, etc.), supports distributed transactions (XA), provides a complete JDBC 3.0 driver (including support for optional features like save points, rowsets, UDT, XA, connection pooling, etc.), and can run in embedded or server mode. It can be included as a jar file in any Java application. Daffodil DB includes Daffodil DB Browser, a GUI-based database management tool that can be used to carry out all database operations such as creating a database, creating database objects, executing SQL statements, and manipulating data, browser database objects, etc.
Sesame is an Open Source RDF Schema-based repository and querying facility. It is a scalable, modular architecture for persistent storage and querying of RDF and RDF Schema. It supports two query languages (SPARQL and SeRQL), and can use main memory or PostgreSQL, MySQL and Oracle 9i databases for storage.
The Easysoft ODBC-JDBC Gateway allows ODBC applications to be used with JDBC databases. It is a fully functional ODBC 3.5 driver that allows you to access any JDBC data source from any ODBC-compatible application. All leading Java databases are supported, including JDataStore, Cloudscape, PointBase, FirstSQL, McKoi, and HSQL. It is compatible with unixODBC, the Linux and Unix driver manager.