Free Open Source VPN Software

The Problem with "Free" VPNs

Before listing genuinely free options, it is worth understanding why most free VPN services are dangerous. Running VPN infrastructure costs money: servers, bandwidth, IP addresses, and maintenance all have real expenses. When a VPN service offers unlimited free access with no visible revenue source, the revenue almost certainly comes from monetizing your data. Research has consistently shown that many free VPN apps in the Google Play and Apple App stores contain tracking libraries, inject advertisements into web pages, sell browsing data to analytics companies, or serve as data collection fronts.

A 2024 study by the Commonwealth Scientific and Industrial Research Organisation (CSIRO) found that 38% of free VPN apps on Android contained some form of malware or tracking, and 18% did not even encrypt traffic despite claiming to provide VPN protection. The apps that performed worst were all closed-source, with no way for researchers to inspect the code before installing and analyzing network behavior.

The free options listed below avoid these problems because they are either open source software you run yourself (giving you full control), or they are operated by organizations with transparent funding models and independently audited codebases.

Self-Hosted Free VPN Software

WireGuard

WireGuard is free, open source, and built into the Linux kernel. There is no commercial version, no premium tier, and no feature gating. Every capability of WireGuard is available to everyone at no cost. The only expense is the server you run it on, which can be a $4 to $6 per month VPS, a Raspberry Pi on your home network, or any spare computer with a public IP address.

WireGuard provides the best performance of any VPN protocol, with throughput approaching native network speeds and reconnection times measured in milliseconds. Configuration requires only a text file with a few lines, and clients are available for every major operating system. For users willing to spend a few minutes on initial setup, WireGuard is the best free VPN option available.

OpenVPN Community Edition

OpenVPN Community Edition is the free, open source version of OpenVPN. It includes the full protocol implementation with no connection limits, no bandwidth restrictions, and no feature limitations. The Community Edition supports all ciphers, all authentication methods, and all transport modes (UDP and TCP) that the protocol offers.

OpenVPN Community Edition does not include a web-based management interface, so administration is done through configuration files and command-line tools. For a single server with a handful of clients, this is straightforward. For larger deployments, third-party management tools like Pritunl (which has a free tier) add a graphical interface on top of the Community Edition.

Algo VPN

Algo VPN is a free, open source set of Ansible scripts that automates the deployment of a hardened VPN server. It sets up either WireGuard or IPsec/IKEv2, configures the server's firewall, generates client configurations, and enables automatic security updates. The tool itself is completely free. You pay only for the cloud server it deploys to.

Algo is developed by Trail of Bits, a respected security research firm, and is designed with a "deploy and forget" philosophy. The resulting server has minimal attack surface, strong default settings, and no ongoing management overhead. It is arguably the easiest way to get a secure, self-hosted VPN running in minutes.

Firezone

Firezone's self-hosted edition is free and open source under the Apache 2.0 license. It provides a web-based management dashboard for WireGuard, with user management, device enrollment via QR codes, firewall rules, and single sign-on integration. The free self-hosted version has no connection limits and includes all features. Firezone also offers a paid cloud-hosted version for those who do not want to manage their own server.

Headscale

Headscale is a free, open source implementation of the Tailscale control server. It lets you build a mesh VPN network using the standard Tailscale clients (which are also open source) with your own infrastructure instead of Tailscale's cloud. There are no per-user fees, no connection limits, and no feature restrictions. Headscale runs as a single Go binary with minimal resource requirements.

SoftEther VPN

SoftEther is a free, open source multi-protocol VPN server that supports its own SSL-VPN protocol alongside OpenVPN, L2TP/IPsec, and SSTP. It is released under the Apache 2.0 license with no commercial restrictions. SoftEther's protocol versatility makes it useful in environments where different clients need to connect using different protocols, and its HTTPS tunneling capability helps bypass restrictive firewalls.

Free VPN Services with Open Source Clients

ProtonVPN Free

ProtonVPN offers a free tier that provides unlimited bandwidth with no data caps, no ads, and no speed throttling beyond the limitations of the free server network. Free users have access to servers in the Netherlands, Japan, and the United States, with one simultaneous connection. All ProtonVPN client applications are open source, and the company publishes independent security audit reports.

ProtonVPN is funded by paid subscribers and by Proton AG's broader product ecosystem (ProtonMail, Proton Drive, Proton Calendar). The free tier serves as an entry point to the paid service, but it is genuinely usable for daily browsing, messaging, and basic privacy protection without spending anything. ProtonVPN is headquartered in Switzerland, which has strong privacy laws and is outside the jurisdiction of the Five Eyes, Nine Eyes, and Fourteen Eyes intelligence-sharing alliances.

Calyx VPN

Calyx VPN is operated by the Calyx Institute, a nonprofit organization dedicated to digital privacy. The service is completely free with no registration, no accounts, and no data limits. You install the app (available for Android, iOS, Windows, macOS, and Linux), tap connect, and your traffic routes through the Calyx Institute's servers. Funding comes from donations and grants rather than user data or advertising.

Calyx VPN uses the Bitmask client, which is open source and supports both OpenVPN and WireGuard. The service does not offer server selection (the app connects to the nearest available server automatically), and there are no advanced configuration options. This simplicity makes it ideal for users who want basic VPN protection with zero setup and zero cost.

Riseup VPN

Riseup VPN is another nonprofit-operated, completely free VPN service. Riseup is a Seattle-based collective that has been providing privacy tools to activists, journalists, and human rights defenders since 1999. Like Calyx VPN, Riseup VPN uses the Bitmask client, requires no registration or account, and has no data caps. The service is funded entirely by donations.

Riseup VPN has a smaller server network than ProtonVPN and does not offer server selection or advanced features. Its primary audience is people in situations where privacy is a matter of personal safety rather than convenience. The organization has a documented history of resisting government demands for user data, including a 2016 case where they chose to rebuild their infrastructure rather than comply with an FBI warrant.

Free vs Self-Hosted: Which Is Better?

Self-hosted VPNs provide better performance, a dedicated IP address, full configuration control, and complete independence from any service provider. The trade-off is that you must manage the server, apply security updates, and pay the monthly VPS hosting fee. For technically inclined users, self-hosting is the better option.

Free VPN services like ProtonVPN, Calyx VPN, and Riseup VPN require no technical knowledge and no ongoing maintenance. They are appropriate for users who want basic privacy protection without setting up and managing server infrastructure. The trade-off is shared servers (which may be slower during peak hours), limited server locations, and reliance on the service operator's continued operation and good faith.

For the highest level of privacy assurance, you can combine both approaches: use a self-hosted WireGuard server for daily browsing and route sensitive traffic through a privacy-focused service like Calyx VPN or the Tor network through Orbot.

What to Avoid

Avoid any free VPN that is not open source. If you cannot inspect the code, you cannot verify the privacy claims. Avoid free VPNs that require extensive permissions on your device beyond what is needed for VPN functionality (network access and the ability to create a VPN tunnel). Avoid free VPNs that are funded by advertising, as they have a financial incentive to track your browsing behavior. And avoid free VPNs from countries with mandatory data retention laws, particularly if the service is not transparent about its jurisdiction and data handling practices.