Wow this is the second time I've hit this question.. Nice graphics..
I've used all of those, Opera I haven't touched in years.. I think the last time I used Open BeOS was still on the market, or maybe its just occupying that part of my memory. Alternative commercial software..
I hate IE, basically hate anything Microsoft. That's a hatred that has built up over decades of watching Microsoft ruin company after company, promising greatness and delivering kludge after kludge. Thank God Steve Jobs, Richard Stallman and Linus Tovalds prevailed and Bill retired.
Firefox has the blood of Netscape in it. Mosaic was the first graphical web browser, but Netscape was the first commercially driven web browser. Microsoft didn't have a web browser for another couple of years. so IE though it dominates the market, has consistently played a game of copy-cat where it's ever trying to own the web, the HTML standard and people's wallets. If you are smart you will not use the IE browser, because it's just another nail in the coffen of consumer freedom. See Microsoft came pretty close to close-sourcing the PC platform with the release of the HD-DVD drive, they were going to wire DRM into the motherboard and the next step would be to disable access to the BIOS and even opening your computer to add memory would be seen as a criminal offense (or at least void your warranty). Microsoft's goal is to do what is good for business, and what is good for business is bad for consumers. So if you care about your freedom to choose, do not use IE for anything if you can help it.
And Safari? That's a Mac browser. I don't know what to say other than it is the, pardon me, gayest browser of the bunch. Supporting well crafted fonts and doesn't seem to do much of anything sexy.