So you are visiting this company that is filtering their Internet traffic, and you for some reason can’t reach this site you just have to visit RIGHT NOW, no problem here’s a list of proxy tools/sites to bypass such security measures;

http://geniushackers.com/blog/2008/01/09/another-list-of-proxy-sites-to-open-blocked-sites/
http://www.ghacks.net/2006/08/04/free-web-proxy-list/ (older list but many still work)

or try these previous posts;
https://readmydamnblog.com/?p=1202 (Utility to browse via US proxy)
https://readmydamnblog.com/?p=1069 (create your own proxy)