- PHC Pack
	http://www.math.uic.edu/~jan/

- TiGERS
	http://www.math.tamu.edu/~rekha/programs.html

- gc
	http://www.hpl.hp.com/personal/Hans_Boehm/gc/gc_source/

- gmp
	ftp://ftp.gnu.org/pub/gnu/gmp/

- gnuplot
	ftp://ftp.gnuplot.vt.edu/pub/gnuplot/

- pari
	ftp://megrez.math.u-bordeaux.fr/pub/pari/
	ftp://www.gn-50uma.de/gn/gn-50uma.de/pari-2.0/