Proxymizer
Proxymizer is distributed under the GNU Public License v2.
IP-to-Country
IP to country database is provided by http://ip-to-country.webhosting.info/. It is released under its specific license (well, I guess it’s a specific one).
SOCKS and HTTP Proxy Component for .NET
Proxymizer uses and recommends the excellent Starksoft Proxy component for .NET, which can be found at http://starksoft.com/. Starksoft proxy component for .NET is released under BSD License.
Country flags
They are taken from Wikipedia, at http://en.wikipedia.org/wiki/ISO_3166-1. All of them are in public domain.
Task scheduler
Proxymizer lazy dudes also added the new Task Scheduler for .NET, at http://www.codeproject.com/KB/cs/tsnewlib.aspx. This library is released under The Code Project Open License (CPOL) 1.02.
Developper’s friends
Of course, we are huge refactorers (not sure the word exists, but you have the idea), and this wouldn’t be as easy without our best friend: https://www.jetbrains.com/resharper/features/code_refactoring.html
Can’t code without
The best C# & VB.NET refactoring plugin for Visual Studio
Smalltalks
Of course, Proxymizer does not endorse any illegal activity. If you country laws say “don’t do it”, respect them, just don’t do it.