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
A relational database management system, based on the principles laid down in the book "Databases, Types, and The Relational Model: The Third Manifesto" by C. J. Date and Hugh Darwen.
Generic Object Oriented Database System
Distributed thick-client OODBMS using aspect-oriented approach to build transparent interface to database from OO programming languages (C++, Java, C#)
Object-oriented simulation-ready database simultaneously supports Java and C# APIs. Fully-transactional. Uses time-stamps and user ID to track all changes. Supports objects with properties whose values change in time under complex patterns.
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EyeDB is an Object Oriented Database Management System (OODBMS) providing an advanced object model (inheritance, collections, arrays, methods, triggers, constraints), an object definition language, an object query language and C++ and Java bindings.
DBIO is a tool to simulate Online Transaction Processing Database, which can be used to model production envirment for I/O test. A standard configuration file contained in the software simulates TPCC-Like I/O workload, which is modeled from DB2 Database running TPCC-Like workload. DBIO can also do data consistency check after the I/O workload test.
picoSQL is an Italian multi-user relational database management system with transactions support. Because it derives from a commercial project, it is already robust, fast, and rather complete.