Download of Opera USB 12.15 was on the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The program lies within Internet & Network Tools, more precisely Browsers. We recommend checking the downloaded files with any free antivirus. The actual developer of the free software is Opera@USB.
From the developer:
Opera@USB and Opera@U3 is a private project by markus obermair,austria. I'd appreciate if some persons make a donation via PayPal. Opera@USB has the same functionality as the Opera Desktopversion. You can also use Opera@USB as Browser/Mailclient on Harddisk.
You may want to check out more software, such as Lock USB, USB Virus Scan or USB-COM-Scanner-Driver, which might be related to Opera USB.