The best open source alternative to Outline VPN is Proton VPN. If that doesn't suit you, our users have ranked more than 100 alternatives to Outline VPN and loads of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Outline VPN are Mullvad VPN, OpenVPN Connect, WireGuard and Tor VPN.
Proton VPN provides Swiss-based online security with a high-speed network, free version, and advanced features like VPN Accelerator, AES-256 encryption, a no-logs policy, and support for platforms including PCs and smartphones, enabling content access globally.
Switzerland
Delivers anonymous, privacy-focused VPN connections with no signup data or logs, anonymous payments, support for the latest encryption, WireGuard multihop, SOCKS5, DNS ad-blocking, kill switch, high-speed servers up to 40Gb/s, and open-source transparency.
Sweden
EU
OpenVPN Connect provides flexible VPN solutions to secure your data communications, whether it's for Internet privacy, remote access for employees, securing IoT, or for networking Cloud data centers.
United States
Proton VPN provides Swiss-based online security with a high-speed network, free version, and advanced features like VPN Accelerator, AES-256 encryption, a no-logs policy, and support for platforms including PCs and smartphones, enabling content access globally.
Switzerland
Implements modern cryptographic standards, maintains a small codebase for security auditing, ensures fast cross-platform VPN performance, supports embedded and enterprise environments, offers easy deployment, IPv4/IPv6, secure key exchange, and mobile app support.
United States
A VPN that grants network-level privacy on mobile by routing app traffic through Tor, assigns each app a separate circuit for improved separation, bypasses app-level censorship, features per-app routing, security via Rust-based implementation, and awaits early adopter feedback.
United States
Windscribe VPN is your all-in-one solution for privacy, security, and unrestricted internet access.
Canada
Enjoy unfiltered Internet access globally using Psiphon's open-source VPN. It offers AES-256 encryption, split tunneling, WireGuard support, and more, all without requiring user registration. Perfect for communities in censored regions and those seeking privacy-focused alternatives.
Canada
A peer-to-peer mesh VPN with zero infrastructure. Create a private network, share a code, and your machines reach each other as if they were on the same LAN. No servers to run, no ports to forward, no static IPs to manage.
NetBird is an open-source Zero Trust networking platform that makes it easy for engineers to create fast, secure, and private networks with simple, decentralized management.
GermanyEU
Privacy-centered VPN with WireGuard, multi-hop connections, built-in ad/tracker blocking, no activity logs, open-source apps, cash or crypto payments, self-hosted servers, independent security audits, no affiliate marketing, privacy donations, and educational guides.
Gibraltar
SoftEther VPN ("SoftEther" means "Software Ethernet") is one of the world's most powerful and easy-to-use multi-protocol VPN software. It runs on Windows, Linux, Mac, FreeBSD and Solaris.
Japan
Decentralized VPN featuring mixnet technology to encrypt traffic and obscure metadata, provides 5-hop and 2-hop privacy modes, WireGuard for speed, AmneziaWG for censorship resistance, hides IP and location, blocks ads, and does not support centralized logs.
Switzerland
