* Astrolog version 4.40 is a powerful,
  customizable, and platform independent
  astrology chart calculation program,
  used in 20+ countries on six continents.
  It is 100% freeware and requires no
  registration fee. :) The complete source
  code is available. Astrolog features:
  wheels, aspects, midpoints, relationship
  charts, transits, progressions, some
  interpretations, astro-graphy, local

  Biology Volume 1 Respiration. The student
  conducts an "electronic dissection" (with
  no mess or killing of animals). Study how
  breathing occurs at various levels of detail
  using live animation. Learning is fun and
  easy using Lifelong Softwares animated and
  interactive tutoring system. Formerly
  available only for schools, now released
  in Shareware.

  DOS command line scientific calculator
  It calculates, evaluates math expressions,
  plots graphs, solves equations, outputs
  tables of data, does statistics, reads and 
  writes to files and printer (up to 32000 
  lines). Bitwise (64 bits) and logical 
  operations and base changes (2-36). 
  Includes predefined constants with state of
  the art precision. 17 digits. Many help
  screens.  Comes with a tutor batch file.

  Our Cosmohood Version 1.03. A 3D View of
  Our Cosmic Neighborhood by Jeff Bondono.
  A star atlas shows a two-dimensional
  projection of the universe onto a piece
  of paper. Of course, the true universe
  is a three-dimensional entity. Our
  Cosmohood enhances your view of our
  cosmic neighborhood by letting you view
  it in three dimensions. Our Cosmohood
  requires a PC-compatible machine with a

  Gravitational N-Body Simulation: 16 bit
  DOS version by Henley Quadling. This
  simple 16 bit Dos protected mode
  application allows you to simulate N
  particles which are subject to their
  gravitational interactions, by clicking
  with a mouse cursor directly on the
  screen. Initial velocities and different
  masses can also be entered. This program
  will use every iota of floating point

  Periodic Table 3.0 (1 of 1) - 110 Elements
  890 isotopes. 500+ radioisotopes with decay 
  trees. Quiz mode. Calculate molecular 
  weights. Compare bond properties. List 
  properties in sorted lists. Graph the 
  properties. Print table, data and decays. 
  Supports clipboard. Has over 30 data items on
  each element, including abundance, melt/boil 
  point, electronegativity, oxydation states, 
  and more.

  Design Segmental Retaining Walls for
  Gravity Wall or Reinforced Geogrid. 
  FREE to registered users. Step-by-step: 
  proj info, elevations, soils, design, 
  panelize, and geogrid placement. Does 
  engineering Factor of Safety analysis 
  -base sliding, overturning, facia shear, 
  bearing capacity, geogrid pullout, 
  bulging, facia connection, & overstress. 
  Recursive calcs & optimizes costs.

  *****************************
  *    SOLAR DATA PLOTTING    *
  *    PROGRAM FOR WINDOWS    *
  *****************************
  *   Plots Sunspot and Solar *
  *   flux values.  Numerous  *
  *   configuration options.  *
  *****************************
  *    Freeware From WA4TTK   *
  *****************************

  STSORBIT PLUS Version 9517: Track and display
  any satellite for which orbital data is avail
  able. Used by NASA and the aerospace industry
  as well as hams and "just plain folks" around
  the world. Math coprocessor chip recommended.
  Now includes Multi-Satellite Tracking Feature.
  By: Dave Ransom, 7130 Avenia Altisima, Rancho
  Palos Verdes, CA  90275  USA.

  Mathomatic V5.7; Symbolic math program
  This program that can automatically
  solve, simplify, combine, and graph
  algebraic equations, etc.  Does
  calculus operations, too.  Mathomatic
  is an inexpensive alternative to
  Mathematica.