Wide-Integer implements a generic C++ template for uint128_t, uint256_t, uint512_t, uint1024_t, etc.

Simple Long Integer Math for C++

A C++ library for big integers and dynamic precision floating-point

BeeNum is an arbitrary-precision arithmetic library.

Simple RSA key generation and encryption library for C++

Reference implementation of std::big_int for C++ (https://isocpp.org/files/papers/P4444R0.html)

long arithmetic library

A library that helps the user to perform all arithematic operations on big integers having up to 1000 digits.

Portable big integer library.

C library for arbitrary-precision arithmetic

A single-file C++ library for arithmetics with arbitrary length numbers

A templated C++ library for big integers and large floating point numbers.

c# big integer implementation on C++ (portable format desired)

C# BigInteger implementation on Python

Arbitrary precision arithmetic

A collection of C++ experiments and code created as part of exploration and practice

Int128 for Unity

RSA encryption calculator using java

C# BigInteger spec ports to other languages

An implementation of big integer library in C++