Download of Oracle11gR2 11.2 was on the developer's website when we last checked. We cannot confirm if there is a free download of this software available. This program is an intellectual property of Oracle. The most popular version among the software users is 11.2. We recommend checking the downloaded files with any free antivirus. The software lies within Development Tools, more precisely Database Tools.
From the developer:
Oracle Database 11g is an affordable, full-featured database for servers with up to four sockets. It includes Oracle Real Application Clusters for higher availability, provides enterprise-class performance and security, is simple to manage, and can easily scale as demand increases. It is also upwardly compatible with Enterprise edition and can easily grow with you, protecting your initial investment.
You may want to check out more software, such as ThinkWave Educator, DBScribe for MySQL or Microsoft Exchange, which might be related to Oracle11gR2.