From Opera Software:
Opera for Ubuntu is a free and innovative web browser which allows you to experience the web on your terms. Discover what over 40 million people have already experienced by downloading Opera's fast and safe Internet browsers. Opera for Ubuntu includes other refinements to help you maximize productivity and get more from your Web-browsing experience. The enhanced Speed Dial, automatic updates, new spell checker, enhanced Opera Mail to send rich text messages, and fine-tuning our overall speed, making Opera faster and smoother on resource-intensive pages such as Gmail.
What's new in this version:
Version 12.15 has provided security and stability enhancements.