Outline clients, developed by Jigsaw
Cross-platform multi-protocol VPN software
Robust and flexible VPN network tunnelling
Tools for easy and quick setup and control VPN via PPTP/L2TP/OpenL2TP
IPsec / IKEv2-based VPN software for Linux.
Network link bonding/trunking/aggregation and multichannel VPN daemon
Small VPN Tool
msvpn - A clientless vpn
the OpenSSH VPN, without the VPN
Daemon making your VPN resilient to disconnections and other failures
GNOME/GTK based GUI front-end for OpenVPN