bigint(20) - man - phpman

Math::BigInt (3perl) - Arbitrary size integer/float math package
Math::BigInt (3pm)   - Arbitrary size integer/float math package
Math::BigInt::Calc (3perl) - Pure Perl module to support Math::BigInt
Math::BigInt::Calc (3pm) - pure Perl module to support Math::BigInt
Math::BigInt::Lib (3perl) - virtual parent class for Math::BigInt libraries
Math::BigInt::Lib (3pm) - virtual parent class for Math::BigInt libraries
bigint (3perl)       - Transparent BigInteger support for Perl
Math::BigInt::FastCalc (3perl) - Math::BigInt::Calc with some XS for more speed
Math::BigInt::GMP (3pm) - backend library for Math::BigInt etc. based on GMP
Math::BigInt::LTM (3pm) - Use the libtommath library for Math::BigInt routines