Alternative Mac Web Browsers

Firefox: This cross-platform browser is popular on both Mac and Windows. It offers one huge advantage over Safari: you can get add-ons for it to add new functionality. A huge library of such add-ons exists.
Opera: The Opera browser has been around for a while and the company specializes in versions for lots of different devices. A Mac OS X version is available and has some interesting features you can check out.
Camino This is a version of the same engine that Firefox is based on. However, it has been built specifically for Mac users, so may look a little more Mac-like. In my tests it is also very fast.
Flock: Flock is another customized version of the Mozilla engine, but it has added features for those using social media sites like Facebook and Twitter.
WebKit: If Webkit looks familiar, it is because it is actually Safari. Or, at least, it is the framework used to make Safari. The difference is that you can download “Webkit Nightly Builds” which is the most up-to-date version of the browser engine and will have new features and speed enhancements long before they are available in the released version of Safari.
Chrome: Google recently entered the browser wars with their own Chrome. (Still waiting for Mac version).