OK you found Opera. So maybe you already know of Firefox.
Well done. …
Here are a few "other browsers"
This isn't a separate browser but a way of rendering web pages in Internet Explorer. It is ideal for the poor sighted and for people who just wish to read a stripped down text page free of ads and graphics.
You might liken it to Lynx: http://www.lynxbrowser.com/
Then there is the Firefoxalike baby K-Meleon:
There are many browsers that you can try. If you can access stuff in Linux of course there are just too many. Honestly, choice is a big problem, unless you just go for the default that comes with your OS: http://sourceforge.net/search/?type_of_search=soft&words=browsers