Section: Software
Pari/Gp
Participants : Karim Belabas [ release manager ] , Bill Allombert [ University of Montpellier ] .
http://pari.math.ubordeaux.fr/
License: GPL 2+
Current stable version: 2.3.3, 2008
Current testing version: 2.4.2.alpha, 2007
Pari/Gp is a widely used computer algebra system designed for fast computations in number theory (factorisation, algebraic number theory, elliptic curves, ...), but it also contains a large number of other useful functions to compute with mathematical entities such as matrices, polynomials, power series, algebraic numbers, etc., and many transcendental functions.

Pari is a C library, allowing fast computations.

Gp is an easytouse interactive shell giving access to the Pari functions.

gp2c , the GPtoC compiler, combines the best of both worlds by compiling Gp scripts to the C language and transparently loading the resulting functions into Gp ; scripts compiled by gp2c will typically run three to four times faster.