Free grey matters software for linux

smf-grey is a Sendmail milter that implements the GreyList Anti SPAM technology.
This technology can significantly reduce the amount of SPAM and viruses going from zombie computers (infected Windows PC), which produce more than 80% of SPAM.
GreyList Sendmail milter has a very effective GreyList algorithm on the base of the tuple: sender IP address (C class subnet), sender envelope and recipient envelope.
Its very recommended to use the smf-grey milter combined with the smf-zombie and the smf-spf milters. Its a triple impact on SPAM and viruses, that will seriously increase the efficiency of filtration.
This milter aims to be lightweight, reliable and simple. Its written in C.
Main features:
- It has a hosts/networks whitelist;
- It has an autowhitelist;
- It can add the information header with GreyList results to scanned messages;
- It can log all milter activities through the syslog service.
Advantages:
- Small code;
- Fast work;
- Stability (production quality);
- Few system resources are required.
Enhancements:
- Whitelists auto reloading was implemented.
- Autowhitelisted records regular dumping and reloading was implemented.
- The default greylisting time period was increased.
- New TODO tasks were added.
- Cosmetic enhancements were made.

Gray-Kde package contains the Kde version of the Gray Color Scheme.

KeyCluster is a high availability (HA) system for mission critical applications running on Solaris (Sparc and x86), Linux, and AIX.
The project guarantees service availability and data access, switching services between machines in case of software or hardware failures in a matter of seconds.
Enhancements:
- The name to was changed KeyCluster and almost all of it was rewritten.
- Built-in support for DRBD and a KeySharing kit based on a shared USB SecureKey to store services status were added.

Coherent Mail Gateway is intended to be a very easy to set up MTA using SMTP and POP3. Greylisting is used on the SMTP daemon to reduce spam.

In addition, quite a lot of checks on the validity of information from the SMTP client (such as claimed server name and sender) are carried out, and anyone caught telling lies is disconnected.

Grey-, black-, and white-listing are supported, as well as (optionally) ClamAV and Spamhaus. The target market is users with static IP addresses. Others can use the system, but its value will be limited to outgoing email.

Simple Monitor is a SuperKaramba theme inspired by the simple but effective "Very Simple Monitors" theme by the user humanthing. Some values are not displayed properly though in Very Simple Monitors (network values and IP). This could be because of different setups. My computer is pretty standard so my theme should function properly on most pcs. http://www.kde-look.org/content/show.php?content=48973
I like a tight and clean desktop, so I simplified the idea even more. This theme is showing all basic information, and nothing more.
Main features:
- Processors type
- Processor speed
- Processor load (number and graph, for one proc)
- Processor Temperature
- Amount of ram used / amount of ram
- amount of swap used / amount of swap
- amound of HDD space used / amount of HDD space total (for "/root" and "/home")
- HDD temperatue (for "/hda", I could add another drive if requested)
- Computer name
- Computer ip
- Network load (up- and download, values and graph)
- Amount of transfered data thrue internet (up- and download) since last boot
Enhancements:
- Made the three blocks clickable.
- The CPU block opens Processor information
- The Memory block opens KsysGuard (youll need to have it installed to be able open it, obviously. Its in Kubuntu by default)
- the Network block opens your computers ip settings window
- Added a line for your computers uptime
- Changed font colors to very dark gray and very light gray, instead of black and white, to make it look softer.

Math::Numbers is a Perl module that contains methods for mathematical approaches of concepts of the number theory.

SYNOPSIS

use Math::Numbers;

my $a = 123;
my $b = 34;

my $numbers = Math::Numbers->new($a, $b [, ...]);

print "They are coprimes (relatively primes)!n" if $numbers->are_coprimes;
print "The greatest common divisor of these at least two numbers is ", $numbers->gcd;

my $number = Math::Numbers->new($a);

print "It is prime!n" if $number->is_prime;

my @divisors = $number->get_divisors;

print "$a is divisor of $b!n" if $number->is_divisor_of($b);

Math::Numbers is quite a simple module on matters of programming. What its interesting is the focus and approach it is intended to be made from the Number Theory basis for Perl beginners (like me) and also for young mathematicians (like me).

The normal topics of Number Theory include divisibility, prime numbers (which is separately intended to be covered by Math::Primes), congruences, quadratic residues, approximation for Real numbers, diophantine equations, etc. and all this is intended to be convered by the module on the concept on getting and setting values and also retriving the proof methods.

METHODS

new

# Some methods require more than only one argument.
my $numbers = Math::Numbers->new($p, $q, ...);

# Some methods require only one.
my $number = Math::Numbers->new($p);

Create a Math::Numbers object. Note that some of the methods will require objects created with only one or a defined numbers of arguments.

gcd
my $gcd = $numbers->gcd;

Calculation of the Greatest Common Divisor. This is made by two different methods which are described below: Blutos algorithm and Euclidean algorithm: The former is used when computing GCD for more than two integers; the latter is used when getting the GCD for two numbers to improve speed. See below for information on each.

Bluto_algorithm

You will mostly not require to call this method, but directly gcd(). Blutos algorithm uses a brute force calculation used by mathematicians to get divisors and then GCD also called Primality Test. Bluto takes some spinaches stolen from Popeye and starts dividing m all the way through 2 to m/2.

Euclidean_algorithm

Euclid rocks. I have a very nice Budgerigar (http://en.wikipedia.org/wiki/Budgerigar) called the same in honor of him (have to upload a pic of him).

As of now, this algorithm is only computed on two integers. From the Wikipedia entry: Given two natural numbers a and b: check if b is zero; if yes, a is the gcd. If not, repeat the process using (respectively) b, and the remainder after dividing a by b. This is exactly what our method does.
is_divisor_of

print "Yes, $p is divisor of $a...n" if $number->is_divisor_of($a);

Lets see if the number from the object is a divisor of $a, which means that the division $number/$a will return an integer (not necesarily a natural). If it does, itll return 1; 0, otherwise.

get_divisors
my @divisors = $number->get_divisors;

What are the divisors of the number brought by the object? This only includes the Natural numbers.

is_prime
print "$p is not prime!n" unless $number->is_prime

Returns 0 or 1 if the number from the object is prime or not, respectively. This method uses the, a bit slow, primality test.

are_coprimes
print "They are coprimes because their GCD is 1!n" if $numbers->are_coprimes;

Are the numbers from the object coprimes (relatively primes)? This means, the GCD is 1; (a, b, c, ...) = 1. Returns 1 or 0.

Instant Picture Creator is an Image Wrapper written in PHP to produce images on demand for websites. It uses filters, so you can manipulate images in every way by adding own filters. Currently it comes with two basic filters for Resizing images (Example: thumbnails) and Manipulation image colour palette. You can combine filters (like ‘Resize-square-100/Palette-grey’) and it is possible to define Shortcuts (like ‘greythumb’).

Filtered images can be cached, so it is fast and only need some more server time at the first image request.

It doesn’t need a special backend interface, you can manipulate images by a request like http://yourserver.com/picture.png?filter=thumbnail (you don’t need to do it by yourself, it will be done by the first request anyway). In this way you can integrate this mechanism very easy in running websites. You can use it only for one (or more) folder (with images) or you can you use Instant Picture Creator in general for all images on your website. Of cause you also can use it in your backends to prepare thumbnails for uploaded images, etc ...

Currently it supports GIF, PNG and JPEG image types.