Opera One is a free web browser that originally started as a research project back in 1995 and today continues to be a fast, safe and secure web browser. Portable version available here. Video walkthrough available.
Vivaldi beta is a free web browser from the original Opera Web Browser founders in 1994, allowing you to preview the upcoming version. Download the stable version here.
BriskBard is a fast freeware web browser using Blink and Trident that also has security features and numerous tools including FTP, email, RSS, and more.
Maxthon Browser for Windows utilizes a unique, innovative dual-core design that uses both Webkit and Trident to provide an advanced browsing experience.
Opera Neon has all the Opera browser features you know with a reboot. It is designed to be a fun, fresh take on Speed Dial, visual tabs and the Omnibox, which kickstart your browsing session.