Libreswan
Third generation of IKE/IPsec software for Linux and other platforms.多平台的第三代IKE/IPsec软件实现,采用C/C++开发并在GPLv2协议下授权。

Libreswan is an IPsec implementation for Linux. It has support for most of the extensions (RFC + IETF drafts) related to IPsec, including IKEv2, X.509 Digital Certificates, NAT Traversal, and many others.
Libreswan 是从Openswan 2.6.38 fork而来,而Openswan是从FreeS/WAN fork而来。
最新版本:3.0
源码主页:https://github.com/libreswan/
官方主页:http://libreswan.org/