Outline clients, developed by Jigsaw
Cross-platform multi-protocol VPN software
SSL VPN Client for Windows (OpenVPN).
Robust and flexible VPN network tunnelling
OpenVPN v2.5.4 patched for Windows XP and Windows Server 2003
Tools for easy and quick setup and control VPN via PPTP/L2TP/OpenL2TP
A graphical user interface for OpenVPN on Mac OS X
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