Sometimes, you may need to use proxy for many reasons, such as browsing pandora.com, to avoid download limit from some websites, etc. UltraSurf is the best among this kinds of apps. But only you can download for Window at their official website. Then I found this links, UltraSurf via pirate bay. I just re upload to dropbox for easy download.
Download Here : https://www.dropbox.com/s/ki2q2c6zt8yxqmo/UltraSurf10.06.dmg
Original Link : http://thepiratebay.sx/torrent/6269153/UltraSurf_for_Mac_
For more details – http://havingspoken.weebly.com/1/post/2013/06/ulrasurf-for-mac.html
Pls share me if you know other way to use Ultrasurf on Mac !