IBM DB2 Express-C is a free database for storing and managing relational and XML data. It is free to download, use, distribute and does not have any expiry period or database size limitations. It can be setup quickly, is easy-to-use, includes self-managing capabilities, and has proven enterprise-class performance and scalability. DB2 supports key development platforms including C/C++, Java, .Net, PHP, Ruby on Rails, etc.