In the field of computer security, Openswan provides a complete IPsec implementation for Linux and FreeBSD.

Openswan, begun as a fork of the now-defunct FreeS/WAN project, continues to use the GNU General Public License.

Unlike the FreeS/WAN project, it does not exclusively target the Linux operating system.

Libreswan forked from Openswan in 2012.

[2] This Linux-related article is a stub.