Free anti spyware software for linux

J Operating System is primarily intended for programmers.
Target Users:
- Hobbiests--You used to buy computers to do programming. They didnt do much else. Windows doesnt even come with a compiler, which is ironic since Bill Gates wrote BASIC. The "J" operating system is primarily intended for programmers. Ive attempted to lower the bar, so amateurs can contribute. I hope to recreate the dynamic environment that used to exist when the Commodore 64 was around and everyone was creating odd-ball software.
- Researchers--Im sure many lab researchers still use DOS because they have to interact with hardware, which is difficult with Windows.
Main features:
- No security! You can access all ports, memory and disk blocks to your hearts content. When youre working with your own computer, security just gets in the way and makes things slow--I hate anti-virus and anti-spyware because they just slow things down. When you know you dont have a risk, have no secrets and do regular back-ups, who needs security?
- Uniformity
- There is no virtual memory and everyone is on the same address-map. You can easily communicate between tasks, passing addresses. Addresses start at a base of zero and, essentually, segment registers are not used.
- There is basically one language to learn called "C+" which is a little more than "C", but less than "C++". You dont need to learn a scripting langauge because everything uses this syntax.
- There is an extension of ASCII called "J" rich text which allows colors, links, graphics and various widgets in your documents. This format is used in source code, documents, help, menus, etc.
- Support for compressed, encrypted and contiguous files.
- FAT32, FAT12 and ISO9660 filesystems.
- Blazing-fast compiler which can recompile everything in 5 seconds. It doesnt optimize.
- All source code is included and its still around a Meg.
Hardware:
- PS/2 mouse and keyboard
- VGA graphics
- Some hard drives. Must be on the primary or secondary IDE controller and support LBA28. Drives of 120Gig are the limit.
- Some CD-ROM/DVD drives, including burning.
- Some floppies. Just 1.44Meg and not all types.
- No USB support yet
- No network support yet
- ASCII printers on the parallel port are supported.

SMC non-context E-mail filter - is an software application designed to significantly reduce the amount of SPAM/UCE (junk-mail) you receive. SMC uses a dynamic local and DNS based remote "whitelists" (for known/trusted senders), DNS based "blacklists" (for undesired senders), and an original "autoauthentication" system (for unknown, but legitimate senders).
In additional SMC has a set of useful features which allows to preserve mail recipients from dangerous message attachments, HTML includes. SMC is an Sendmail milter (plugin), which stops the junk-mail without receiving one.
SMC uses 3 original algorithms, one of which is "Check relay by NS" simulates a dynamical whitelist and will always accept the messages from mail systems satisfying to following conditions:
1. Mail domain name (the host part of the senders e-mail address) must have an MX records;
2. Mail domain name and the connection host address must be resolved;
3. Connection host must be listed at the one of nameservers which hold the senders mail domain name.
The second from the developed algorithms is a "check delays" algorithm which is based on statistical check of delivery delays, generated by a [tempfail] return code, that allows to exclude a direct receiving of a mail, which not passed through the standard mail server.
NOTE: Using this feature the delivery of the mail from unknown, but legitimate senders will be delayed for a count of 10-minutes checks, which setted by the "maxcount" configuration parameter.
And the third of original algorithms is "auto-authentication" algorithm: The sender of a "mail contact" (sender-recipient pair) means as authenticated (whitelisted) if the filters statistics module has registered the both of a sended forward (request) and a recieved backward (reply) messages of this contact. The messages from the such authenticated senders will never be delayed by the previous "check delay" algorithm.
Enhancements:
- CLOSE_WAIT problems have been solved (a critical bug).
- There is a critical bugfix to prevent DNS storms.
- All of the resolver functions use the local resolver context.
- Automake and autoconf support have been added.

GNU Sauce is an anti-spam server. SAUCE (Software Against Unsolicited Commercial Email) is an SMTP server that sits between the Internet and your actual mail software. It was originally written to help in the fight against spam, but it also helps encourage good configuration and administration in general.

SAUCE has various tactics for DETECTING incoming spam:


Extremely aggressive checks on incoming email and its sources. If any problems are discovered the mail is not accepted.
Spambait addresses: when mail is sent to a bait address its sources are blacklisted.
Mail from previously-unknown sources is delayed to give them a chance to try a bait address or get their account cancelled.

Pros:

SAUCE is very sucessful. It can cut spam by an order of magnitude.
Administrators using SAUCE have to deal with much less bounced mail.
SAUCE never bounces legitimate mail from correct, non-spamming sites.

Cons:

Most spam sources are misconfigured, but many other sites are too, and SAUCE will bounce their mail. SAUCE is not for you if clueless strangers often send you mail thats important to you.
SAUCE delays mail from new senders and sites (configurable, though).
SAUCE is something of a resource hog.
SAUCE is hard to install, especially if youre not using Debian.
SAUCE is controversial, because it deliberately rejects mail for technical deficiencies which wouldnt make it undeliverable.

SAUCE is not a users mailer. It must be installed on a mail hub by the system administrator. It needs existing SMTP software, which must have standard anti-spam features such as relay prevention, checking recipients during the SMTP conversation, etc. Currently you must be using Exim, though support for other mailers could be added.

Untangle Gateway Platform is a Linux-based network gateway with pluggable modules for network applications like spam blocking, Web filtering, anti-virus, anti-spyware, intrusion prevention, VPN, SSL VPN, firewall, and more.
- Commercial-grade open source alternative to SonicWALL and WatchGuard
- 14 integrated apps - use one or all of them
- Runs on off-the-shelf hardware
Enhancements:
- A package of 5.0.1 as a VMware Virtual Appliance has been released.

Taskbar is a small taskbar utility for X11 with advanced features.
It supports a program launcher menu, task list, and tray notification area. It will work with any EWMH window manager (Sawfish, Metacity, KWM, etc.).
It is designed to be lightweight yet fully functional.
Main features:
- Docking taskbar aligned to bottom or top of screen
- Customizable start menu (program launcher)
- Taskbar notification area with tooltip support (area is populated via plugins)
- Support for Xft anti-aliased fonts

Spammer is an anti-spam mail filter for the popular MTA Sendmail.

Spammer checks all IP-Addresses found in the mail header against a DNS blacklist (such as the one from Easynet, Spamcop or Osirusoft).

Depending on the configuration, Spammer rejects mails from well-known spam sources or tags them with an additional line in the header and a special prefix in the subject.

Spammer requires Sendmail to be compiled with milter support. If youre using Debian Linux you need to install the libmilter-package.