Opera Portable Edition is a lightweight, customizable browser designed for speed. It's the popular Opera web browser packaged as a portable app, so you can take your browser with you. Opera Portable Editions' features include: mouse gestures, Opera Turbo, speed dial, Opera link, customization, Opera Mail, Opera Unite, Content blocking, and sophisticated tabs. From PortableApps
The PortableApps.com Platform™ is a full-featured portable software menu, backup utility, app store, automatic updater and application management system that ties all your portable apps together and lets you build your own custom portable app suite. Add new apps with the portable app store, organize them by category or folder, choose the look and color you want and automatically update everything, all with one easy-to-use system. Just drop it on your portable device and you're ready to go.