ProxyChecker - Only software, that downloads free proxy lists from network, and checks them.
Why ProxyChecker?

• Frequently updated list of proxy list URLs;
• Fully automated proxy list download and checking;
• Supported proxy protocols: SOCKS4, SOCKS4A, SOCKS5, HTTP (HTTPS), WinGate-Telnet;
• GeoIP support;
• Proxy reply speed checking (ping);
• Simplicity in use.