Proxy roatotor on Server

I have a number of proxies that I want to use in my office on different systems. But I think it will be very hectic for me to distribute all proxies on each system. So I want to put these proxiws on server so that proxies can changed automatically in a fix time interval. I just want ot know that is there any paid or free service/tool that can rotate my proxies on my server regularly. I have searched for such thing but I didn't find anything. So please help me if you know any service that can do it.


Thanks,.