Kalkulator
Kalkulator for Windows: the Mother of All Calculators, a Swiss Army knife for scientists, engineers and students.
http://www.wrotniak.net/works/kalkulator/

Finite Mathematics
Covers transcendental functions, algebraic functions and the graphing of functions.
http://campus.northpark.edu/math/PreCalculus/TOC.html

Dr. Vogel's Gallery of Calculus Pathologies
Dr. Vogel's Gallery of Calculus Pathologies
http://www.math.tamu.edu/~tom.vogel/gallery/gallery.html

IVision
A LabVIEW tookit that covers digital camera drivers, image processing functions, read/write AVI, video and audio recording, video blending and editing functions. It has over 300 functions and support firewire, USB camera and DV camcorder.
http://www.hytekautomation.com/Products/IVision.html

Using Win32 (WinAPI) functions in Visual FoxPro
Adding the Microsoft Win32 functionality increases the Visual FoxPro application\
http://www.news2news.com/vfp/

Exponential and Logarithmic Functions
Explanation of functions and properties including differentiation and derivative.
http://www.ping.be/~ping1339/exp.htm

PHParadise
PHParadise | PHP code snippet from lixlpixel PHParadise, the php source code collection where you get the function and php code snippet you need... (brought to you by lixlpixel)
http://fundisom.com/phparadise/php

Business Functions
Excel functions for projecting costs and revenues, coping with time periods and growth.
http://www.businessfunctions.com

My Arbitrary Precision Math Library (MAPM)
Home of the MAPM Arbitrary Precision Math Library
http://www.tc.umn.edu/~ringx004/mapm-main.html

SSC, Inc.
SSC, Inc. Mainframe Operating System Services and Support
http://www.sscmainframe.com/freeware.htm