Free protection against viruses software for linux

PokerTH is a Texas Holdem Poker Engine.

PokerTH is a Single-Player Poker Game written in C++/QT4.

You can play the popular Texas Holdem Poker against up to four computer-opponents. Its available for Linux and Windows.

TrackMeNot is a Firefox extension that protects users against search data profiling by issuing randomized queries to popular search-engines.

F-Prot Antivirus security software package has various components that help keep your system secure from viruses, backdoors, trojans and other malicious programs. The project includes the RealTime Protector, a memory-resident monitoring utility that observes all files accessed on your system, a Scheduler where you can set the Scanner to make automatic scans or updates on your system at any time and an Updater to manage all signature updates.
For home users using the Linux open-source operating system, we offer F-Prot Antivirus for Linux Workstations. F-Prot Antivirus for Linux Workstations utilizes the renowned F-Prot Antivirus scanning engine for primary scan but has in addition to that a system of internal heuristics devised to search for unknown viruses
F-Prot Antivirus for Linux was especially developed to effectively eradicate viruses threatening workstations running Linux. It provides full protection against macro viruses and other forms of malicious software - including Trojans.
Main features:
- Scans for over 191534 known viruses and their variants
- Ability to perform scheduled scans when used with the cron utility
- Scans hard drives, CD-ROMS, diskettes, network drives, directories and specific files
- Scans for images of boot sector viruses, macro viruses and Trojan Horses
F-Prot Antivirus for Linux Workstations is FREE for use by personal users on personal workstations

PhishTank SiteChecker is an extension which provides extra protection against phishing.
PhishTank SiteChecker gives Firefox users a way to bring the community judgment of PhishTank into their favorite browser, for extra protection against phishing.
SiteChecker comes in English, Swedish, Dutch, Chinese (simplified and traditional), Italian, Spanish, French, German, Croatian, Japanese, Korean, Swedish, Norwegian, Brazilian and more translations all the time.
Visits to known phishing sites are blocked; the user has the option to continue.
Main features:
- Customizable status bar
- Preferences for changing the behavior of the icon click
- The ability to turn off the phishing filter
- SafeView (this is called continue in the extension) allows you to view the phishing site temporarly before reloading the filter
- An Up-To-Date blacklist using data from PhishTank.
- BloodHound - Dynamic URL matching
- Very fast
- Free!

About AVG Anti-Virus:

• AVG Professional Single Edition is perfectly designed to give you the maximum antivirus protection for your single home PC or workstation.
• It is simple to install and operate. No IT expertise is required and it can run in the background, providing uninterrupted protection. All file and e-mail activity is checked automatically, allowing you to get on with your work without worrying about viruses.
• It is extremely fast, reliable and light on resources, so, no matter how demanding a user you are, it will not slow down your performance.

Enhancements: Added detection of new variants of trojans SHeur2.ANNO, BackDoor.Hupigon5.LCW, SHeur2.ANOR, Downloader.Generic8.AXOI, PSW.Banker5.ONF, Generic13.BPUS.

ProSum is a terminal based program that protects your files, sys_call_table and IDT like tripwire way (All in user space, without kernel modules).
In addition, database with files etc. could be encrypted with Blowfish algorythm and files that are protected could be store at any secure/bastion host to later replace them. You can disable sys_call_table and IDT support for Non-Linux systems. ProSum could be run on any UNIX system, at least with file protect mode (without IDT and sys_call_table support). ProSum was designed for if you run it on Linux x86 platform, kernel havent LKM support or have any type of protection against load and unload LKM, for many protection. Anyway this is not neccesary, but is recommended.
Main features:
- - IDT, Kernel Symbols and Syscall hacking protection throught /dev/kmem for Linux x86 (developing protection for Linux sparc).
- File protection in a Tripwire way on any UNIX POSIX compliant.
- Database encryption with Blowfish algorythm on any UNIX.
- Recover files which are protected from a bastion/secure host.
- Syscall hacking by method described on http://www.big.net.au/~silvio/stealth-syscall.txt protection.
Enhancements:
- INSTALL.es translated to english on INSTALL.en Support for extended flags on Linux.
- To run program you need password that you define in config_prosum.h
- User could be specify random seed for ivec to encrypt BBDD.
- Now encryption support works, tested on Linux, *BSD and Solaris.
- Fixed removing absolute path on snd_tcp_serv.c
- Now you can compile program without gettext support with --disable-nls
- OpenSSL API have been removed for encryption support because there are many problems with it and non-Linux systems, and API of GnuPG 1.0.7 have been added.
- Fixed malfunctions with GNU make.
- Now you can protect files from different hosts in an unique bastion host.
- Now you can protect files that starting by a point (.).
- Added protection against kernel symbols hacking on Linux x86.
- Fixed BUG on big endianess architecture machines with htons() and md5.
- Fixed BUG with getopt().
- Fixed BUG when program comprobes if file were symbolic link.
- Internal code reestructuration.
- Fixed return type of signal() for portability.
- Changed way for handling errors.
- Added lock file for prevent that more than one ProSum can be running at the same me.

IRC Defender is a Perl program for protecting your IRC network against malware. It can protect you against virus drones, general troublemakers, ban evasion, and attacks.


The program will background, and auto join the channel you have defined where the commands given below are accepted. Please be sure to secure your channel (e.g. set +O on it) so that normal users may not access these commands!

While the program is running, you may edit its config file then do a remote rehash (e.g. via /rehash defender.*) to cause its configuration files to be re-read. When you do this any modules you have removed from the configuration will be unloaded, and any you have added will be freshly loaded. Any that remain unchanged will be re-initialised as though the bot was just reloaded by hand.

Arnos IPTABLES firewall script was initially written because I needed to protect my single-homed Linux machine at work. I wrote it at the time I couldnt find any script that really satisfied my needs except for one that was written by a guy called Seven.
I helped him for several months with the work on his script by suppling patches, reporting bugs etc. In this period I was fortunately also able to master scripting for iptables myself because soon Seven discontinued his work, I never got to even talk to the guy ever again. At that point I decided to continue his work, or actually I started my own branch based on his script.
In the summer of 2002 I finally got an ADSL connection at home. Initially I used the iptables firewall that came with the great ADSL4LINUX-package (http://www.adsl4linux.nl). But it didnt take me long to come to the conclusion that their iptables firewall lacked important features like port-forwarding and flexbility with "trusted hosts" etc.
I also didnt like the fact that I had to use a different firewall for my home machine and the machine at work. This made me decide to use some of the ADSL4LINUX knowledge to implement ADSL support.
By now (about 1 year later as of writing) there are only few remnants left of Sevens original script and many, many, many improvements were applied. One major improvement is the ADSL and NAT support (Check the features page with the specifiations of my firewall). For version 2 (alpha) I plan to completely rewrite to script to make it more flexible and to increase the usability for others.
Main features:
- Very secure stateful filtering firewall
- Both kernel 2.4 & 2.6 support
- It can be used for both single- and multi(eg. dual)-homed boxes
- Masquerading (NAT) and SNAT support
- Multiple external (internet) interfaces
- Support multiroute NAT & SNAT (load balancing over multiple (internet) interfaces)
- Port forwarding (NAT)
- Support MAC address filtering
- Support for DSL/ADSL modems
- Support for PPPoE, PPPoA and bridging modem setups
- Support for static and ISP assigned (DHCP) IPs
- Support for (transparent) proxies
- Full support for DMZs and DMZ-2-LAN forwarding. You can also use it to isolate your eg. wireless LAN.
- (Nmap)(stealth) portscan detection
- Protection against SYN-flooding (DoS attacks)
- Protection against ICMP-flooding (DoS attacks)
- Extensive user-definable logging with rate limiting to prevent log flooding
- Includes options to optimize your throughput
- User definable open ports, closed ports, trusted hosts, blocked hosts etc.
- Log & protection options are both highly customizable
- Support for custom iptables rules in a seperate file
- It can be used with chkconfig runlevel system (eg. RedHat/Fedora)
- Main focus on TCP/UDP/ICMP but additional support for *ALL* IP protocols
- It works with Freeswan IPSEC (VPN) & SSH Sentinel (http://www.freeswan.org) (+virtual IPs)
- It works with PoPTop PPTP (http://www.poptop.org)
- It works with UPnP
- DRDOS protection/detection (experimental)
- Its easy to configure
- And much more.
Enhancements:
- This release fixes a nasty bug in the NAT forwarding rules that caused using subnet-source-restrictions not to work.
- It adds an extra rule to the DHCP server section to allow packets from DHCP servers in the same segment.
- There are several plugin updates.
- A Racoon IPSEC VPN plugin and a transparent DNAT plugin have been added.