AppArmor is a framework for enforcing security policies on processes. Reading, writing and executing other files can be limited.

Bacula is a network-based backup solution that offers a scalable infrastructure to backup everything from a single host to networks consisting of hundreds of computers.

OpenVPN is an application to tunnel IP networks over a single TCP or UDP port in order to create a virtual private network (VPN). Authentication and encryption is done using the OpenSSL library. In contrast to IPSec the protocol is simple and robust.

Tor stands for "The Onion Router" or "Tor's Onion Router" and is an implementation of a second-generation onion routing network, which allows totally anonymous communication over the Internet.