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I'm glad OW got a mention here; I miss its tabs very much. More than just putting the tabs vertically, it included a thumbnail and a scrollbar, both of which I found incredibly helpful; my workflow hasn't been the same since I switched away from it.

Yup. They also had a list view that's similar to what's being shown here.

Omniweb was great back in the day, it's too bad it's no longer around.

Or is it? http://omnistaging.omnigroup.com/omniweb/

Now with OS X 10.9 support!

Something Omniweb did(/does?) was remove common prefixes from the titles of multiple open tabs from the same web site. This further served to maximize usage of limited screen real estate (something that vertical tabs already helps with greatly, of course). I wonder if there's an addon for any modern browsers to do this. I'll need to check once I get home.

Safari does something very similar on 10.9. I think it looks at the titles of all the tabs and tries to find the sections that have least commonality between them (not just common prefix).