OK, so the title is a bit misleading, perhaps even redundant, especially for the alternative-browser mavens resident on these forums!
As with all articles like this, some good ones are missed, and some well-known ones are re-hashed. However, some good points are made. Like the fact the Portable Firefox uses 35% less memory, or that Safari is available for Windows
Also, read the comments, some missing ones are given honorable mentions...
There are more browsers than you are aware of. Besides Firefox, Opera and Internet Explorer there is a number of promising alternatives which can improve your flexibility, increase your productivity and enrich your browsing experience.
...
Recently we’ve selected over 20 Win/Mac/Linux-browsers, installed most of them, tested them, compared them and now present the results below. Let’s take a closer look at some rather unknown, forgotten, advanced or experimental browsers. What else do we have on the horizon? What should we use? And what might we be willing to use? Apparently, between Firefox, Opera and Internet Explorer there is enough room for creative and unusual approaches.
from Weird Daily 
