Matlab
Currently, Matlab is installed in Linux and Windows XP operating system.
Octave
( http://www.gnu.org/software/octave/ )
GNU Octave is a high-level language, primarily intended for numerical computations. It provides a convenient command line interface for solving linear and nonlinear problems numerically, and for performing other numerical experiments using a language that is mostly compatible with Matlab. It may also be used as a batch-oriented language.
Maxima
Maxima is a Computer Algebra System for the manipulation of symbolic and numerical expressions, including differentiation, integration, Taylor series, Laplace transforms, ordinary differential equations, systems of linear equations, polynomials, and sets, lists, vectors, matrices, and tensors. Maxima yields high precision numeric results by using exact fractions, arbitrary precision integers, and variable precision floating point numbers. Maxima can plot functions and data in two and three dimensions.
OpenOffice
PDF viewer
We have few ways to open pdf file.
(1) If you use Gnome desktop
Open a terminal and type the command:
$ gpdf file.pdf
or
$ evince file.pdf
(2) If you use KDE desktop
Open a terminal and type the command:
$ kpdf file.pdf
Reference: Howto Open a PDF file under Linux / FreeBSD
Xemacs