Free Tools To Fight Against Viruses, Spywares And Other Malwares

Ad-Aware Free Internet Security
Ad-Aware Free Internet Security features real-time protection, advanced genotype detection technology, rootkit protection, automatic updates, and much more — to ensure that you have the power to protect yourself online.
Features

Comprehensive Malware Protection
Ad-Watch Live! Basic Real-time Protection
Genotype Detection Technology
Behavior-Based Heuristics Detection
Rootkit Removal System
The Neutralizer Malware Removal Tool
Download Guard for Internet Explorer
The Scheduler
Easy to [...]

Free Rootkit Detection And Removal Tools For Windows

GMER
GMER is an application that detects and removes rootkits .
It scans for:

hidden processes
hidden threads
hidden modules
hidden services
hidden files
hidden Alternate Data Streams
hidden registry keys
drivers hooking SSDT
drivers hooking IDT
drivers hooking IRP calls
inline hooks

Supported Platform: Windows NT/W2K/XP/VISTA
Website: http://www.gmer.net/
F-Secure BlackLight
F-Secure BlackLight is a tool that detects files, folders and processes hidden from the user and other programs. BlackLight is [...]

Windows Password Recovery Tools

Free Windows Password Recovery Tools
Cain & Abel
Cain & Abel is a password recovery tool for Microsoft Operating Systems. It allows easy recovery of various kind of passwords by sniffing the network, cracking encrypted passwords using Dictionary, Brute-Force and Cryptanalysis attacks, recording VoIP conversations, decoding scrambled passwords, recovering wireless network keys, revealing password boxes, uncovering cached [...]

Free Online Malware Scanners

Scanning With Multiple Antivirus Engines
Filterbit
Filtebit (powered by Metascan) enables you to upload files for scanning, analysis and identification by multiple antivirus engines.
Antivirus Engines: 11
Website: http://www.filterbit.com
Jotti
Jotti’s malware scan is a free online service that enables you to scan suspicious files with several (around 20) anti-virus programs.
Antivirus Engines: 19
Website: http://virusscan.jotti.org/
NoVirusThanks
NoVirusThanks allows users to upload and scan a [...]

Webbrowsing through a remote machine using SSH connection

There are times when you want to connect to the Internet through unknown and/or insecure networks such as a wifihotspot. If you aren’t careful, you might make it all too easy for someone to sniff your connection.
There are times when you want to connect to the Internet using your remote machine’s (US) IP address. Because [...]

How to convert Putty’s private key (.ppk) into OpenSSH’s private key format in Windows?

If you generated a Putty private key (.ppk) in Windows and you want to use it with a SSH or SFTP client (for example Gnome Terminal, Nautilus, gFTP) in Linux, you have to convert it to OpenSSH’s private key format, because putty private key format (.ppk) is not compatible with OpenSSH.
Okay, open PuTTYgen and [...]

How to convert PuTTY’s private key (.ppk) into OpenSSH’s private key format in Linux?

If you want to use your PuTTY generated private key (.ppk) in Linux with not only PuTTY, but other SSH or SFTP client (Terminal, Nautilus, GFTP, etc), you have to convert it to OpenSSH’s private key format, because PuTTY private key format (.ppk) is not compatible with OpenSSH.
First, install “putty-tools” package, if you did [...]

How to check MD5 hash and create checksum file in Windows and Linux?

MD5 is a widely used cryptographic hash function with a 128-bit hash value. It is commonly used to check the integrity of files.
If you downloaded a file from the web and the file owner provided a MD5 hash (checksum) then you can compare the hash of the downloaded file with the hash provided by file [...]