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Befriend (Befriend 2..3): A popular open-source VPN known for its ease of use and security. It's widely used for both personal use and professional settings.
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P2P (P2P 3.1.1): Another open-source VPN that's known for its reliability and speed. It's often used by professionals and for security-conscious users.
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NetNanny (NetNanny 3..1): A widely used open-source VPN that's maintained by the Apache Project. It's known for its open-source nature and flexibility.
These VPNs are all well-regarded for their security and usability, and they are continuously getting updates to improve their functionality and performance. For the most up-to-date information, I recommend checking the official websites or recent publications on VPNs.
