Wisco Word Power
Teacher vocabulary test activities.
http://wiscocomputing.com/wordpwr.htm

Program Chemistry
An electronic processing of the Periodic Table. List of chemical elements and their properties, searching and testing software. Many useful functions which paper table doesn't have.
http://www.tabulka.cz/english/

Math Rescue
Fun educational math game for children ages 4 to 12, that teaches addition and subtraction. From Apogee Software, Ltd.
http://www.apogee1.com/math/index.html

Word Rescue
Game for children ages that teaches spelling, word meanings, logic and reading.
http://www.apogee1.com/word/index.html

New GeoClock
Displays the current time around the world, local sunrise, local sunset, latitude and longitude lines, and the sun's azimuth and elevation. With an updated map of the Earth showing the sun's position.
http://home.att.net/~geoclock/

PC-ECAP
AC circuit analysis program designed for anyone interested in electronics. The software is easy to use and will handle circuits with up to 90 nodes and 1000 components. High resolution graphs can be viewed or printed.
http://www.cdquickcache.com/pcecap.htm

IngMath
Program can be used for study purposes by students and for mathematical calculations by engineers, natural scientists and mathematicians. It covers linear algebra, linear programming, transport optimization and rational functions.
http://www.verw.tu-dresden.de/IngMath/ingmathe.html