Free algebra system software for linux

All System Info is a system info SuperKaramba theme. Simple english version...
It shows:
- System Info
- CPU usage
- Network Usage
- Memory Load
- HDD usage

Bubble system superkaramba theme is based on my own sk theme Rounded debian (avalible on kde-look.org).

Bubble system has two versions - big and small. You can change backgroud and bar image for each every single buble.

Background can be with debian logo or with tux. Selection can be done by right-clicking on buble (circle) and opening "Configure theme".

Dont be shy to comment, what you like / dislike.

Aigaion Bibliography System is a Web-based shared bibliography manager built on PHP/MySQL. Aigaion Bibliography System project is based on the BibTeX format, but has support for other formats as well.
Main features:
- extensive support for organizing a bibliography in a topic structure
- personal and public annotations on each publication
- multi-user support
- easy import/export
- intuitive user interface
Enhancements:
- A remote SQL injection vulnerability issue was fixed.

Math::Algebra::Symbols is a Symbolic Algebra in Pure Perl.

SYNOPSIS

Example symbols.pl
#!perl -w -I..

use Math::Algebra::Symbols hyper=>1;
use Test::Simple tests=>5;

($n, $x, $y) = symbols(qw(n x y));

$a += ($x**8 - 1)/($x-1);
$b += sin($x)**2 + cos($x)**2;
$c += (sin($n*$x) + cos($n*$x))->d->d->d->d / (sin($n*$x)+cos($n*$x));
$d = tanh($x+$y) == (tanh($x)+tanh($y))/(1+tanh($x)*tanh($y));
($e,$f) = @{($x**2 eq 5*$x-6) > $x};

print "$an$bn$cn$dn$e,$fn";

ok("$a" eq $x+$x**2+$x**3+$x**4+$x**5+$x**6+$x**7+1);
ok("$b" eq 1);
ok("$c" eq $n**4);
ok("$d" eq 1);
ok("$e,$f" eq 2,3);

My Media System is a media system with you in control. It lets other applications such as MPlayer, VDR, or Xine take care of what they respectively do best, and integrates them into one system, that is easy to understand and operate.

By combining their individual strength, you get the best of all worlds, in one media application.

MMS is easy to install, configure and use. Its even translated to 9 languages so there a good chance its available in your native tongue.

Geo::Raster is a Perl extension for raster algebra.

SYNOPSIS

use Geo::Raster;
or
use Geo::Raster qw(:types);
or
use Geo::Raster qw(:types :logics :db);

Geo::Raster is an object-oriented interface to libral, a C library for rasters and raster algebra. Geo::Raster makes using libral easy and adds some very useful functionality to it. libral rasters are in-memory for fast and easy processing. libral rasters can be created from GDAL rasters. GDAL provides access to rasters in many formats.

Geo::Raster also adds the required functionality to display rasters in Gtk2::Ex::Geo.

Each cell in raster/grid is assumed to be a square.

The grid point represents the center of the cell and not the area of the cell (when such distinction needs to be made). TODO: This needs more attention.

A grid is indexed like this:

j = 0..N-1
------------------>
.
i = 0..M-1 .
.
.
V
there is also a (x,y) world coordinate system
maxY ^
.
.
y .
minY .
------------------>
minX maxX
x

minX is the left edge of first cell in line. maxX is the right edge of the last cell in a line. minY and maxY represent similarly the boundaries of the raster.

Oxylus Newsletters System is a complex newsletter system. It allows you to manage multiple groups.
You can import and export users, and public subscription is allowed. Oxylus Newsletters System project allows linux users to schedule newsletters for a specific date using a crontab job.
For each sent newsletter, you can see its history and whether it was successfully sent.
Enhancements:
- This version is fully compatible with PHP5.
- The mails are sent just once to all the users.
- The SQL error which occurred when new groups are created was fixed.
- Various framework bugfixes were made.