Cross-platform multi-protocol VPN software. Pull requests are welcome. The stable version is available at https://github.com/SoftEtherVPN/SoftEtherVPN_Stable.

strongSwan - IPsec-based VPN

libreswan

L2TP and L2TP/IPsec support for NetworkManager

IPsec (Cisco/Juniper) VPN concentrator client

Decapsulate traffic encapsulated within GRE, IPIP, 6in4, ESP (ipsec) protocols, can also remove IEEE 802.1Q (virtual lan) header. Works with pcap files.

Linux Kernel XFRM offload via eBPF/XDP

Mirror/fork of sourceforge ipsec-tools

IPsec implementaion for Debian/Ubuntu originally developed by KAME project and widely used by Apple and NetBSD

strongswan Debian Packaging

Android Client Application

MIPS Assembler optimized IPsec cryptographic modules

strongswan build script with dependency packages

vpnc with minor fixes for recent compiler versions