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Column Explanations:
Sql Std = Sql standard compliance, 89, 92...Sub=Subset/Limited
Tr = Transaction support, SP = Stored Procedures and Triggers
RI = Referential integrity rules in database, OB = On-line-backup functionality
BL = Blob, Binary Large Objects, to store images and other binary objects in.
Active = Software is Maintined and Actively developed or the year of last known update.

Multi platform, Different operating systems

Java based, Operating system independent

Windows version only

Linux version only

Specific Other Os like VMS, MacOs

Free databases

Name

Producer

Sql Std

R
I

S
P

T
R

B
L

O
B

Active

Description

Postgresql

Open Source

92

x

x

x

x

x

yes

A SQL implementation that can compete with commercial databases such as IBM, Microsoft and Oracle. This database (along with MySQL) is the leading GPL'ed database system for the GNU/Linux & BSD platforms. Fully Transactional, full data Atomicity, Consistency, Isolation and Durability (ACID). properties. Seven different levels of locking for consistent queries and updates. Support for Triggers, user defined data types, stored procedures. Multiple index type (b-tree, hash, etc.) Windows Installer version here

MaxDb/Sap AG

MySql/Sap AG

92

x

x

x

x

yes

The German Company SAP known for their application has released their formerly proprietary database to the public domain under the GPL/LGPL license. A time ago renaming this to MaxDb and cooperating with MySql to develop the software, The Result of this, or if it is going to be priced in the future is unclear. Multi feature database, an "oracle7-clone". A Free Enterprise-class database!

McKoiSQL

McKoiSQL

92

x

x

x

yes

Multi-threaded, multi-client operations. Released under the GPL license.

Hypersonic SQL/hsqldb

Open Source

Sub

x

yes

Java in-memory SQL-Database, Can be client or server based or both. Open-source pure- Java database. Small and fast, embeddable relational DB written entirely in Java. Subset of the SQL standard.

Gadfly

Open Source

Sub

?

2002

Small, portable database system written in python. The gadfly Source code freely available. Was commercially supported by Chordate Systems

CQL++

Machine Independent Software

89

??

yes

CQL++ is a SQL and B-tree/ISAM database management system for several machines and operating systems! License as a GNU GPL license. Support ISAM or B-tree access, Concurrency control with shared read locks.

GNU SQL

89 92

??

1998

Russian Gnu database project. Development seems to have stalled in 1998.

Firebird

Open Source

92

x

x

x

x

yes

InterBase from InterBase Corp or Borland or free sw Firebird ? don't ask me. Firebird is a commercially independent project of C and C++ programmers, technical advisor's and supporters developing and enhancing a multi-platform relational database management system based on the source code released by Inprise Corp (now known as Borland Software Corp).

GigaBASE

GNU License

x

x

yes

Memory & file-based databases with an SQL-like query language. For embedding into applications. BSD-like license. and FastDB

Leap

Open Source

2001

LEAP is an RDBMS used as an educational tool to help students, and assist researchers and teachers as they study and teach databases. It is distributed under the terms of the GNU General Public License.

SqlLite

Open Source

92

yes

SQLite is a C library that implements an embeddable SQL database engine. Programs that link with the SQLite library can have SQL database access without running a separate RDBMS process. ( Windows and Linux version )

Sleepycat Software

Open Source

yes

Open Source embedded database system Berkeley DB! Berkeley DB is a programmatic toolkit that provides fast, reliable, scalable, and mission-critical database support to software developers.

Ocelot

Open Source

92 99

?

?

yes

Ocelot is not minimum SQL, Ocelot is not a subset of SQL, Ocelot is SQL. THE OCELOT SQL DBMS supports primary and foreign keys, subqueries, outer joins, views, unions, intervals, datetime arithmetic, character sets, alters, domains, commit/rollback, case expressions, floats, national sorts, the information schema, casts, assertions with check clauses, group by and having, schemas ...and, to make a long list short, everything.

Ozone

Open Source

?

2002

The ozone Database research project. A small group of developers who see the need of such a technology under an open source license. Has multi-user, multi-thread support, object level access rights, fully transaction based JTA/XA support, deadlock recognition, XML (DOM) support, ODMG 3.0 support and more.