Links for islpy
islpy-2011.1.tar.gz
islpy-2011.3.tar.gz
islpy-2011.2.tar.gz
islpy-2013.1.tar.gz
2011.2 home_page
2013.1 home_page
2011.3 home_page
2011.1 home_page
http://documen.tician.de/islpy
https://code.google.com/p/gmpy/
http://gmplib.org/
http://www.kotnet.org/~skimo/isl/