WireGuard is nice.
There is always a trust issue having VPN hosted by third party. Especially if it's free!
Brook - Cross-platform(Linux/MacOS/Windows/Android/iOS) proxy/vpn software.
DSVPN - Dead Simple VPN, designed to address the most common use case for using a VPN.
sshuttle - Transparent proxy server that works as a poor man's VPN. Forwards over ssh. Doesn't require admin.
Passepartout - User-friendly OpenVPN client app for iOS.
RadVPN - Decentralized VPN.
N2N - Light VPN software which make it easy to create virtual networks bypassing intermediate firewalls.
Orchid - Enables a decentralized virtual private network (VPN), allowing users to buy bandwidth from a global pool of service providers.