Sentinel is described as 'Network is a network layer that enables a true p2p and decentralized applications and resources marketplace' and is an app in the Security & Privacy category. There are more than 100 alternatives to Sentinel for a variety of platforms, including Windows, Mac, Android, iPhone and iPad. The best alternative is Tor Browser, which is both free and Open Source. Other great apps like Sentinel are Tor (Free, Open Source), ProtonVPN (Freemium, Open Source), Psiphon (Freemium, Open Source) and Mullvad (Paid, Open Source).
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.