IBM DB2 Express-C
IBM DB2 Express-C is a member of the IBM DB2 family of powerful data server software for managing both relational and XML data. DB2 Express-C is a free, no-limits, and easy to use edition of DB2. The 'C' in DB2 Express-C stands for the Community. A community of DB2 Express-C users that bands together to assist each other, both online and offline.
DB2 Express-C shares the same core functionality and code-base as the other priced editions of DB2 on Linux, UNIX, and Windows. DB2 Express-C can be run on either 32-bit or 64-bit systems with Linux or Windows operating systems. It is also available on Solaris (x64) and as a beta on Mac OS X (x64). It can be run on systems with any amount of processors and memory and does not have any specialized storage or system setup requirements. DB2 Express-C also includes pureXML at no charge. pureXML is a technology unique to DB2 that stores and processes XML documents natively.
The DB2 Express-C edition offers a best-of-breed product at no cost. It delivers the freedom to develop, deploy and distribute without any database size limitations, while still including the same core functionality and pureXML technology as the other editions of DB2. DB2 Express-C supports a wide array of clients, drivers and development languages, and it provides an easy upgrade path to other DB2 editions.
The license of this software is Freeware, you can free download and free use this database management software.