There's a new, very  good  site,  with  lots of information about
scientific and  other  software  packages  running  under  Linux.
There are two fast mirror sites:

In the US       http://SAL.KachinaTech.COM

In Europe       http://ftp.llp.fu-berlin.de/lsoft/

SAL deserves a very close look, I believe.

SAL  defined:  SAL  (Scientific   Applications  on  Linux)  is  a
collection of information and links of software  that  scientists
and engineers will be interested in.  The broad coverage on Linux
applications  will  also  benefit the whole Linux/Unix community.
The popularity  of  SAL  has  led  a  new  categorizing scheme, a
friendly user interface and a greatly  expanded  repertoire  with
more  detailed  information.  We hope you will enjoy the new SAL!
SAL is copyrighted and can be freely redistributed under GNU GPL,
otherwise stated by their respective owners.

Applications available  in:  *  Mathematics  * Computer Graphics,
Images  &  Signals  Computer  Algebra   Systems*   Processing   &
Visualization*  Array-Oriented  &  Linear  Algebra  Systems* CAD,
Drawing & Painting  Tools*  Statistics*  Modelers* Number Theory*
Raytracers* Misc*  Image  Viewer,  Conversions  &  Manipulations*
Geographic Information Systems * Numerical Analysis* Misc* Source
Code   Repositories   *   Discrete  Methods  &  Related  Tools  *
Programming Languages &  Compilers  Tools  & Utilities * Parallel
Computing* GLTM/OpenGLTM Related Libraries & Toolkits Programming
Languages &  Systems  Other  Graphic  Libraries  *  Communication
Libraries  *  X11  Libraries  & Toolkits Tools & Utilities Misc *
Office Software  Office  Suites  *  Scientific  Data Processing &
Visualization Typesetting  &  Formating  Software  Packages  Word
Processing & Publishing Libraries Spreadsheets * Other Scientific
Fields  Electrical  &  Related  Software*  Chemistry,  Biology  &
RelatedMisc, etc.
....
eof