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In computer security, Nessus is a free comprehensive vulnerability scanning software. Its goal is to detect potential vulnerabilities on the tested systems. For example:

* Vulnerabilities that allow a remote cracker 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.

On UNIX (including Mac OS X), it consists of nessusd, the Nessus daemon, which does the scanning, and nessus, the client, which controls scans and presents the vulnerability results to the user. For Windows, Nessus 3 installs as an executable and has a self-contained scanning, reporting and management system.

Nessus is the world’s most popular vulnerability scanner, estimated to be used by over 75,000 organizations worldwide. It took first place in the 2000, 2003, and 2006 security tools survey from SecTools.Org.

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PuTTY is a terminal emulator application which can act as a client for the SSH, Telnet, rlogin, and raw TCP computing protocols. The name “PuTTY” has no definitive meaning.[1]

PuTTY was originally written for Microsoft Windows, but it has been ported to various other operating systems. Official ports are available for some Unix-like platforms, with work-in-progress ports to Classic Mac OS and Mac OS X, and unofficial ports have been contributed to platforms such as Symbian powered mobile phones.

PuTTY was written and maintained primarily by Simon Tatham and is currently beta software. Licensed under the MIT License, PuTTY is free and open source software.

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traceroute is a computer network tool used to determine the route taken by packets across an IP network. An IPv6 variant, traceroute6, is also widely available.

The traceroute tool is available on practically all Unix-like operating systems. Variants with similar functionality are also available, such as tracepath on modern Linux installations and tracert on Microsoft Windows operating systems. Windows NT-based operating systems also provide pathping, which provides similar functionality.

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WinSCP (Windows Secure copy) is an open source SFTP and FTP client for Microsoft Windows. Its main function is secure file transfer between a local and a remote computer. Beyond this, WinSCP offers basic file manager functionality. For secure transfers, it uses Secure Shell (SSH) and supports the legacy SCP protocol in addition to SFTP.

Development of WinSCP started around May 2000 and continues. Originally it was hosted by the University of Economics in Prague, where its author worked at the time. Since July 16, 2003 it is licensed under GPL and hosted on SourceForge.net.