One of the most nifty organizational tools I have come across. The browsers got into tabs in place of different windows a long time ago and I'm surprised this hasn't been an in built feature of any of the modern Operating Systems. TidyTabs is only there when you need it and you can customize things to suite your needs. It's also been made to interoperate well with other great software.
Some would complain that it's only for Windows. But I don't care since I don't own a Mac or Linux computer. It's an excellent productivity tool. Best part is there is a free version that is actually good enough for most people.