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LibYAML is a YAML 1.1 parser and emitter written in C.

Ruby is...  A dynamic, open source programming language with a focus on simplicity and productivity. It has an elegant syntax that is natural to read and easy to write.

iw is a new nl80211 based CLI configuration utility for wireless devices. It supports all new drivers that have been added to the kernel recently. The old tool iwconfing, which uses Wireless Extensions interface, is deprecated and it's strongly recommended to switch to iw and nl80211.

The screen program allows you to use multiple windows (virtual VT100 terminals) in Unix.

A very fast network logon cracker which support many different services.

ethtool is the standard Linux utility for controlling network drivers and hardware, particularly for wired Ethernet devices. It can be used to:
 

rdesktop is a free, open source client for Microsoft's proprietary Remote Desktop Protocol (RDP). It is released under the GNU General Public License and is available on Unix-like systems such as BSD and Linux.

As of August 2013, rdesktop implements a large subset of the RDP 5 protocol, including:

Ettercap is a comprehensive suite for man in the middle attacks. It features sniffing of live connections, content filtering on the fly and many other interesting tricks. It supports active and passive dissection of many protocols and includes many features for network and host analysis.

Nessus allows scans for the following types of vulnerabilities: 

Vulnerabilities that allow a remote hacker to control or access sensitive data on a system.
Misconfiguration (e.g. open mail relay, missing patches, etc.).
Default passwords, a few common passwords, and blank/absent passwords on some system accounts.
Nessus can also call Hydra (an external tool) to launch a dictionary attack.
Denials of service against the TCP/IP stack by using mangled packets

The stunnel program is designed to work as an SSL encryption wrapper between remote client and local (inetd-startable) or remote server. It can be used to add SSL functionality to commonly used inetd daemons like POP2, POP3, and IMAP servers without any changes in the programs' code. Stunnel uses the OpenSSL library for cryptography, so it supports whatever cryptographic algorithms are compiled into the library.  Stunnel can benefit from FIPS 140-2 certification of the OpenSSL library, as long as the building process meets its Security Policy.