80 of the Best Linux Security Applications

Anti-Virus
AMaViS Mail virus scanner
Avast! Virus protection, with anti-spyware and anti-rootkit software
AVG Free Anti-virus and Anti-spyware software
ClamAV Anti-virus toolkit for e-mail scanning on mail gateways
P3Scan Scans email messages
Anti-Malware
chkrootkit Check for signs of a rootkit
OSSEC Rootkit detection
Nixory Anti Spyware program open source for Mozilla Firefox
rkhunter Scans for rootkits, backdoors and possible local exploits 

Encryption
GnuPG Encrypt and sign data and communication
MailCrypt Simple interface to public key cryptography with PGP
MCrypt Developer tool for adding a wide range of encryption functions
OpenSignature Digital signature of documents
PeaZip Portable, open source archiving, encryption and file split tool
Seahorse GNOME application for managing encryption keys
Steghide Hide data in various kinds of image- and audio-files
Stunnel Encrypt arbitrary TCP connections inside SSL (Secure Sockets Layer)
TrueCrypt Disk encryption software
Firewalls / Network Gateways
ClarkConnect Dedicated firewall and Internet server/gateway
FireHOL Stateful iptables packet filtering firewall configurator
Firestarter Visual firewall program
Netfilter Packet filtering framework
IPCop Linux firewall distribution
ShellTer Iptables-based firewall
Shorewall High-level tool for configuring Netfilter
Untangle Quality open source alternative to SonicWALL and WatchGuard
Turtle Firewall Firewall configuration project based on Linux 2.4.x/2.6.x and iptables
Vuumuur Powerful firewall manager built on top of iptables
Intrusion Detection
AFICK Monitor the changes on your filesystems
BASE Web front-end to query and analyze the alerts from a SNORT IDS system
Bro Passively monitors network traffic and looks for suspicious activity
Kismet Wireless network detector, sniffer, and intrusion detection system
OSSEC Open Source Host-based Intrusion Detection System
Sguil Analyst Console for Network Security Monitoring
SNARE System iNtrusion Analysis and Reporting Environment
Snort Network intrusion prevention and detection
Snort_inline Modified version of Snort
Tripwire Provides configuration audit and control features 
Network Monitoring
AIM Sniff Monitoring and archiving AOL Instant Messenger and MSN messages
Argus Fixed-model Real Time Flow Monitor
Nagios Host and network monitoring tool
Nipper Network Infrastructure Configuration Parser
NSAT Network Security Analysis Tool
ntop Network traffic probe that shows the network usage
SEC Simple Event Correlator
SniffDet Remote Sniffer Detection Tool/Library
tcpdump Network debugging tool

Network Traffic Analyzer
dsniff Collection of tools for network auditing and penetration testing
Ettercap Multipurpose sniffer/interceptor/logger for switched LAN
ngrep Network grep
Kismet Wireless network detector, sniffer, and intrusion detection system
Wireshark Network protocol analyzer

Packet Crafting
Hping3 TCP/IP packet assembler/analyzer
Nemesis Packet crafting and injection utility
Scapy Interactive packet manipulation program
Yersinia Network tool to take advantage of weaknesses in network protocols 

Portscanner
Angry IP Scanner Fast and friendly network scanner
Knocker TCP security port scanner
Unicornscan User-land Distributed TCP/IP stack

Vulnerability Scanner
Nessus Comprehensive vulnerability scanning software
SARA Third generation security analysis tool that is based on the SATAN model
Tiger Perform a security audit of UNIX systems 

Log File Analyzers
AWStats Advanced web, streaming, ftp or mail server statistics, graphically
IPtables Log Analyzer Analyzes the log output from an iptables firewall
tcpreplay Use previously captured traffic in libpcap format to test network devices
tcptrace Analyze TCP dump files
The Webalizer Web server log file analysis 

Data Removal
Darik’s Boot and Nuke Self-contained boot floppy that securely wipes hard disks
Wipe Secure file wiping utility

Password Management
Figaro’s PM GNOME application that allows password to be securely stored
KeePassX  Lightweight and easy-to-use password manager 

VPN Tools
Poptop PPTP server solution
OpenVPN Full-featured SSL VPN solution
SSL Explorer Fully-featured, web-based SSL VPN server

Forensics
ODESSA Open Digital Evidence Search and Seizure Architecture
 Other Tools
Denyhosts SSH attack prevention
iptables Configure the Netfilter tables, chains, and rules
mtr Network diagnostic tool
Netcat Reads and writes data across network connections
Nikto Web server scanner performing tests against web servers
OpenSSH SSH connectivity tools
Smart Sign Smartcard based digital signature

80 of the Best Linux Security Applications


Anti-Virus

AMaViS Mail virus scanner

Avast! Virus protection, with anti-spyware and anti-rootkit software

AVG Free Anti-virus and Anti-spyware software

ClamAV Anti-virus toolkit for e-mail scanning on mail gateways

P3Scan Scans email messages


Anti-Malware

chkrootkit Check for signs of a rootkit

OSSEC Rootkit detection

Nixory Anti Spyware program open source for Mozilla Firefox

rkhunter Scans for rootkits, backdoors and possible local exploits


Encryption

GnuPG Encrypt and sign data and communication

MailCrypt Simple interface to public key cryptography with PGP

MCrypt Developer tool for adding a wide range of encryption functions

OpenSignature Digital signature of documents

PeaZip Portable, open source archiving, encryption and file split tool

Seahorse GNOME application for managing encryption keys

Steghide Hide data in various kinds of image- and audio-files

Stunnel Encrypt arbitrary TCP connections inside SSL (Secure Sockets Layer)

TrueCrypt Disk encryption software


Firewalls / Network Gateways

ClarkConnect Dedicated firewall and Internet server/gateway

FireHOL Stateful iptables packet filtering firewall configurator

Firestarter Visual firewall program

Netfilter Packet filtering framework

IPCop Linux firewall distribution

ShellTer Iptables-based firewall

Shorewall High-level tool for configuring Netfilter

Untangle Quality open source alternative to SonicWALL and WatchGuard

Turtle Firewall Firewall configuration project based on Linux 2.4.x/2.6.x and iptables

Vuumuur Powerful firewall manager built on top of iptables


Intrusion Detection

AFICK Monitor the changes on your filesystems

BASE Web front-end to query and analyze the alerts from a SNORT IDS system

Bro Passively monitors network traffic and looks for suspicious activity

Kismet Wireless network detector, sniffer, and intrusion detection system

OSSEC Open Source Host-based Intrusion Detection System

Sguil Analyst Console for Network Security Monitoring

SNARE System iNtrusion Analysis and Reporting Environment

Snort Network intrusion prevention and detection

Snort_inline Modified version of Snort

Tripwire Provides configuration audit and control features

Network Monitoring

AIM Sniff Monitoring and archiving AOL Instant Messenger and MSN messages

Argus Fixed-model Real Time Flow Monitor

Nagios Host and network monitoring tool

Nipper Network Infrastructure Configuration Parser

NSAT Network Security Analysis Tool

ntop Network traffic probe that shows the network usage

SEC Simple Event Correlator

SniffDet Remote Sniffer Detection Tool/Library

tcpdump Network debugging tool


Network Traffic Analyzer

dsniff Collection of tools for network auditing and penetration testing

Ettercap Multipurpose sniffer/interceptor/logger for switched LAN

ngrep Network grep

Kismet Wireless network detector, sniffer, and intrusion detection system

Wireshark Network protocol analyzer


Packet Crafting

Hping3 TCP/IP packet assembler/analyzer

Nemesis Packet crafting and injection utility

Scapy Interactive packet manipulation program

Yersinia Network tool to take advantage of weaknesses in network protocols


Portscanner

Angry IP Scanner Fast and friendly network scanner

Knocker TCP security port scanner

Unicornscan User-land Distributed TCP/IP stack


Vulnerability Scanner

Nessus Comprehensive vulnerability scanning software

SARA Third generation security analysis tool that is based on the SATAN model

Tiger Perform a security audit of UNIX systems


Log File Analyzers

AWStats Advanced web, streaming, ftp or mail server statistics, graphically

IPtables Log Analyzer Analyzes the log output from an iptables firewall

tcpreplay Use previously captured traffic in libpcap format to test network devices

tcptrace Analyze TCP dump files

The Webalizer Web server log file analysis


Data Removal

Darik’s Boot and Nuke Self-contained boot floppy that securely wipes hard disks

Wipe Secure file wiping utility


Password Management

Figaro’s PM GNOME application that allows password to be securely stored

KeePassX  Lightweight and easy-to-use password manager


VPN Tools

Poptop PPTP server solution

OpenVPN Full-featured SSL VPN solution

SSL Explorer Fully-featured, web-based SSL VPN server


Forensics

ODESSA Open Digital Evidence Search and Seizure Architecture


Other Tools

Denyhosts SSH attack prevention

iptables Configure the Netfilter tables, chains, and rules

mtr Network diagnostic tool

Netcat Reads and writes data across network connections

Nikto Web server scanner performing tests against web servers

OpenSSH SSH connectivity tools

Smart Sign Smartcard based digital signature

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