Free, open-source & self-hosted, Bitcoin payments
Qtum Core Wallet
Free, open-source crypto trading bot, automated bitcoin trading
Decred daemon in Go (golang)
OpenZeppelin Contracts is a library for secure smart contracts
A Framework for Building High Value Public Blockchains
The AirGap Wallet is installed on an everyday smartphone
Stellar's public monorepo of go code
A decentralized bitcoin exchange network
A Binance Smart Chain client based on the go-ethereum fork
DDN, Data Delivery Network, a next generation blockchain system
Blockchain in C#/.NET for on-chain, decentralized gaming
Forensic tool to recover lost BTC private keys.
The safest way to store private data in untrusted (cloud) environments
Bitcoin Alts portfolio tracker, email / text / alexa / telegram alerts
Visualize Solidity control flow for smart contract security analysis
Tendermint Core (BFT Consensus) in Go
DataFrame server for financial timeseries data
Mastering the Lightning Network (LN)
Chainquery parses and syncs the LBRY blockchain data
The Blockstack Browser allows you to explore the Blockstack internet
Decentralized websites using Bitcoin crypto and BitTorrent network
(Formerly Solium) Code quality & Security Linter for Solidity
Neo's Series Technology Document
A blockchain-based DNS + HTTP server that fixes HTTPS security