big-int topic

Arbitrary-sized integer class for C++

faheel

Small portable multiple-precision unsigned integer arithmetic in C

kokke

Library for Multiprecision Compile-Time and Run-Time Arithmetic (including Modular Arithmetic)

niekbouman

PHP Base62 encoder and decoder for integers and big integers with Laravel 5 support.

SiroDiaz

BigInt in C++

grim-firefly

BeeNum is an arbitrary-precision arithmetic library.

tigertv