PenguinProxy is described as 'A free, secure, Peer2Peer VPN' and is a VPN service in the security & privacy category. There are more than 100 alternatives to PenguinProxy for a variety of platforms, including Windows, Mac, Linux, Android and Android Tablet. The best alternative is Tor Browser, which is both free and Open Source. Other great apps like PenguinProxy are Tor, ProtonVPN, Mullvad and Windscribe.
PenguinProxy is mainly a VPN Service but alternatives to it may also be Anonymizing Networks or Web Browsers. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of PenguinProxy.
Proxyhound is based on syn scan's proxy address acquisition tool, It can scan up to tens of thousands IP addresses per second, providing rawsocket and WinPcap scanning mode, scan results can be directly http, https, socks4, socks5 proxy validated.
NCP Secure Entry Client. The universal IPsec client with comfortable features and the support of strong authentication, e.g. electronic certificates, for deployment in VPN environments by third-party manufacturer. Supports 64-bit Windows.