Pi at Multiple Dimension  
   Online Php program that lets you verify that pi is same in 2d 3d and 4d.
   http://projectpi.sourceforge.net/2d3d4d_o.php

The Hfloat Page  
   Algorithms and software for calculating pi and e.
   http://www.jjj.de/hfloat/hfloatpage.html

Stu's pi page  
   A fast program to compute Pi and a comparison with other programs run on windows.
   http://home.istar.ca/~lyster/pi.html

PiHex  
   Distributed computing project calculating specific parts of Pi in Hexadecimal system.
   http://www.cecm.sfu.ca/projects/pihex/

SourceForge.net: Project Filelist  
   List of downloadable source code of open source programs to compute Pi.
   http://sourceforge.net/project/showfiles.php?group_id=54167

efg's Computer Lab: Buffon's Needles Lab Report  
   A project describing how to estimate the value of pi using Buffon's Needles. Includes math description and complete Delphi source code.
   http://www.efg2.com/Lab/Mathematics/Buffon.htm

Pi Program based on FFT and AGM  
   Calculation Program based on FFT and AGM. This is a package to calculate PI in huge digits, programmed for a benchmark of a FFT based multiple-precision routine.
   http://momonga.t.u-tokyo.ac.jp/~ooura/pi_fft.html

Roy's Pi Page  
   A Program in C to compute the famous transcendental, and some remarks on making it work with the Borland Turbo C++ and other information on Pi.
   http://www.cacr.caltech.edu/~roy/upi/pi.html

Armpi 4 for the ARM processors  
   Armpi 4 is a program that calculates pi in decimal for the ARM processors (in particular for the Acorn Risc PC).
   http://www.vinc17.org/acorn/armpi/armpi4/index_eng.html

Jasonp's Pi programs  
   Huge supply of different pi programs known as well as links to most of the unknown ones.
   http://www.boo.net/~jasonp/pipage.html

Austin's Wasted Cycles  
   Austin's Wasted Cycles is a CGI which computers either pi or factorials over the web.
   http://havoc.gtf.gatech.edu/austin/legend/useless/numbers.shtml

Computing Pi  
   Computing Pi by Harry J. Smith both explains and provides examples of how to calculate pi.
   http://pw1.netcom.com/~hjsmith/Pi.html

Martin's Pi Page  
   Provides a program and explanation for pi computations.
   http://freespace.virgin.net/martin.mamo/fpi.html

Archimedes And The Computation Of Pi  
   Java applets illustrating Archimedes' construction graphically and interactively.
   http://www.math.utah.edu/~alfeld/Archimedes/Archimedes.html

HiPiLib - High Performance Libraries  
   Home of PIOLOGIE, a library for arbitrary precision arithmetic, operating on natural, integer and rational numbers. Also used for calculating pi.
   http://www.hipilib.de/

Carey Bloodworth's Pi programs  
   Good Pi calculating porograms and FFT multiplication, NTT, Nussbaumer convolution, and Schonhage-Strassen convolution.
   http://members.tripod.com/careybloodworth/pi.htm

Pi, Pi, Pi  
   Includes 50,000 digits of PI, a C program to work out PI and a page on "the most useless formula for computing PI".
   http://www.ballandclaw.com/upi/pi.html