Calculating Pi
- Investigates and implements algorithms which may yield to distributed computation of the mathematical constant Pi.
- http://projectpi.sourceforge.net/

MM61
- Attempt at factoring the huge Mersenne number 2^(2^61-1)-1. Software for Windows, DOS and Linux. Work reservation via email.
- http://anthony.d.forbes.googlepages.com/mm61.htm

RSA Security - Challenges
- Monetary prizes for factoring certain large numbers ("RSA Numbers"), as well as breaking RSA and DES encryption schemes; announcements mailing list.
- http://www.rsa.com/rsalabs/node.asp?id=2091

Proth Search Page
- A list of prime number searches using Yves Gallot's proth.exe program, available to download. Maintained by Ray Ballinger.
- http://www.prothsearch.net/

Generalized Fermat Primes Search
- Project provides software to search for primes of a specific form. Coordinated via email.
- http://perso.orange.fr/yves.gallot/primes/

Goldbach's Conjecture and Factoring the Cryptographic Modulus
- Algebraic Factoring of the Cryptography Modulus and Proof of Goldbach's Conjecture
- http://www.coolissues.com/mathematics/Goldbach/goldbach.htm

The Prime Pages
- Prof. Chris Caldwell's database of virtually every large or otherwise interesting prime number known; includes the 5,000 largest known prime numbers and records for specific types.
- http://primes.utm.edu/

Search for the Largest Proth Prime
- An internet group to help find the 5th largest prime number, coordinated by William Garnett. Windows/Linux software available.
- http://home.comcast.net/~wfgarnett3/

distributed.net
- A distributed computing project currently trying to take the RSA challenge of RC5-64, and also working on OGR-24 and 25 (Optimal Golomb Rulers). Previous projects included CSC and DES.
- http://www.distributed.net/

The Riesel Sieve Project
- Distributed project to help solve the Riesel problem through the use of donated unused CPU cycles.
- http://www.rieselsieve.com/

Seventeen Or Bust
- A distributed attack on the Sierpinski problem, trying to find the last remaining 17 numbers.
- http://www.seventeenorbust.com

Great Internet Mersenne Prime Search
- Online search for Mersenne prime numbers, found largest several primes.
- http://www.mersenne.org/

Ellipsa - Elliptic Curve Primality Proving
- Primo, a primality proving program based on the ECPP algorithm. With Primo one can check crypto-primes and prove whether or not they are actually prime.
- http://www.ellipsa.net/

ECMNET
- Project to factor numbers using the elliptic curve method. Client and server software.
- http://www.loria.fr/~zimmerma/records/ecmnet.html