free C++ class library of cryptographic schemes

Flowercoin

A pure and powerful JavaScript Litecoin library

Bitcoin Core integration/staging tree

A full stack for bitcoin and blockchain-based applications

Password cracking rules and masks for hashcat that I generated from cracked passwords.

Passphrase wordlist and hashcat rules for offline cracking of long, complex passwords

An open source Bitcoin wallet password and seed recovery tool designed for the case where you already know most of your password/seed, but need assistance in trying different possible combinations.

SHA256/scrypt/X11/X13/X15 genesis blocks for virtual currencies

Database-free, self-hosted Bitcoin explorer, via RPC to Bitcoin Core.

crypto cpuminer (linux + windows)

MIT-licensed C implementation of getblocktemplate

z-nomp is mining pool software for Zcash and Zclassic so you can create internet money in your home!

An open source block explorer