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ike-scan is a command-line tool that uses the IKE protocol to discover, fingerprint and test IPsec VPN servers. It is available for Linux, Unix, MacOS and Windows under the GPL license.

Angry IP Scanner (or simply ipscan) is an open-source and cross-platform network scanner designed to be fast and simple to use. It scans IP addresses and ports as well as has many other features.
It is widely used by network administrators and just curious users around the world, including large and small enterprises, banks, and government agencies.
It runs on Linux, Windows, and Mac OS X, possibly supporting other platforms as well.

Advanced traceroute
Firewalk employs traceroute-like techniques to analyze IP packet responses to determine gateway ACL filters and map networks. This classic tool was rewritten from scratch in October 2002.

An Innovative Password Hash Cracker
The RainbowCrack tool is a hash cracker that makes use of a large-scale time-memory trade-off. A traditional brute force cracker tries all possible plaintexts one by one, which can be time consuming for complex passwords. RainbowCrack uses a time-memory trade-off to do all the cracking-time computation in advance and store the results in so-called "rainbow tables".

NBTscan is a program for scanning IP networks for NetBIOS name information. It sends NetBIOS status query to each address in supplied range and lists received information in human readable form. For each responded host it lists IP address, NetBIOS computer name, logged-in user name and MAC address.

WebScarab is a framework for analysing applications that communicate using the HTTP and HTTPS protocols. It is written in Java, and is thus portable to many platforms. WebScarab has several modes of operation, implemented by a number of plugins. In its most common usage, WebScarab operates as an intercepting proxy, allowing the operator to review and modify requests created by the browser before they are sent to the server, and to review and modify responses returned from the server before they are received by the browser. WebScarab is able to intercept both HTTP and HTTPS communication. The operator can also review the conversations (requests and responses) that have passed through WebScarab.

P0f v2 is a versatile passive OS fingerprinting tool. P0f can identify the operating system on:
- machines that connect to your box (SYN mode),
- machines you connect to (SYN+ACK mode),
- machine you cannot connect to (RST+ mode),
- machines whose communications you can observe.
P0f can also do many other tricks, and can detect or measure the following:
- firewall presence, NAT use (useful for policy enforcement),
- existence of a load balancer setup,
- the distance to the remote system and its uptime,
- other guy's network hookup (DSL, OC3, avian carriers) and his ISP.

Secure your files and communication w/advanced encryption
PGP is the famous encryption program by Phil Zimmerman which helps secure your data from eavesdroppers and other risks.

Sam Spade is a general-purpose Internet utility package, with some extra features to help in tracing the source of spam and other forms of Internet harassment. Sam Spade features include:
ping - nslookup - whois - IP block - dig - traceroute finger - SMTP VRFY - web browser keep-alive - DNS zone transfer - SMTP relay check - Usenet cancel check - website download - website search - email header analysis - Email blacklist - query Abuse address - And More...

A Windows-only port scanner, pinger, and resolver
SuperScan is a free Windows-only closed-source TCP/UDP port scanner by Foundstone.
SuperScan 4 is an update of the highly popular Windows port scanning tool, SuperScan