FLINT (Fast Library for Number Theory)
Python code to implement various number theory, elliptic curve and finite field computations.
Julia bindings for the FLINT number theory C library
Elementary Number Theory: Primes, Congruences, and Secrets
Algebraic Number Theory package
Open-source number theory textbook
Dirichlet .NET Number Theory Library
A comprehensive open source computer algebra system for computations in algebra, geometry, and number theory.
Number theory: primes, arithmetic functions, modular computations, special sequences
Javascript taught Music Theory
A General Theory of Reactivity
Spartan type theory
Graph theory (network) library for visualisation and analysis
Blog: Programming theory, Java, Android