Sets Two modules for sets of positive integers. (Update 2007-12-08: new version)
Graphs
Multiprecision integers
Multiprecision integers: a Fortran module (manual)
Polynomials (standard, one variable)
Polynomials (multivariate, Laurent)
Polynomials (a little less dynamic)
Polynomials: a Fortran module (manual)
Software and data for producing the Ising partition function for C_n x C_n (Update 2007-06-15: new version)