There aren't a lot of reliable and VPNs for Mac that are free available. Some of them are capable of infecting your Mac with malware and viruses. However, some premium VPN providers do provide free plans that feature high-end security and high-speed speeds and intuitive applications that don't require technical expertise to use.

ExpressVPN is the most reliable free vpn mac that provides top-of-the-line security, performance and reliability. It has a 256-bit encryption and strict policies of not keeping logs. It also has a large number of servers across 94 countries. It also has advanced security features like split tunneling and Stealth Guard, which can shut down applications (like torrent clients) which aren't connected to the VPN connection. Its discover here macOS app is easy to use and also supports Apple's new M1 and M2 chips.

PrivadoVPN is a second option. Its headquarters is in Switzerland which has strict privacy laws. It doesn't have speeds limits for free users. However it does limit the amount of data used per month. Its macOS application is simple to use and has a sleek appearance. Its biggest drawback, however, is that it doesn't support all major streaming platforms.

Windscribe is another option, but it doesn't have as much capacity for servers as the other providers on this list. The free plan is unlimited data, however it doesn't offer streaming services, and its speeds are a bit slow. It does, however, include a no-speed-cap policy and features a clean minimalist design.