Firebird RDBMS offers ANSI SQL features & runs on Linux, Windows & several Unix platforms. Features excellent concurrency & performance & powerful stored procedure & trigger language.
More information and downloads at https://firebirdsql.org/, issue tracker is https://github.com/FirebirdSQL/firebird/issues
BearDB is a database provider for modern web applications and javascript frameworks.
BearDB is our Relational Database System which runs on most platforms and supports multiple programming languages. A REST server allows web applications to go directly to the database.
BigBear is our Large Scale Database System which supports SQL. BigBear is similar to modern distributed NoSQL database systems, with the addition of support for SQL and a REST server.
Tiny and easy to use JDBC framework, simplifies usage of JDBC driver
A simple JDBC framework (JAR) by Jeff Smith. Employs database independent, unchecked exception code. Supports Oracle, mySQL, HSQL, and PostgreSQL--can be easily extended to new databases. See article (originally published on Developer.com ) here: http://softtechdesign.com/products/SQLExecutor/SQLExecutor.htm