The least popular of the browsers listed, Opera initially required a user fee, but is now free. It supports all major web standards, including HTML5, CSS3 and SVG, and it works on Mac OS X, Windows and Linux. It is the only computer browser that has a phone version (see a complete review of mobile browsers here), and although it may not offer as many features as other browsers, it has the sleekest interface and is fast, secure and very easy to use.