White papers from the blockchain space:
The one that started it all: Satoshi Nakamoto’s whitepaper Bitcoin: a Peer-to-peer Electronic Cash System.
Factom’s whitepaper on scaling blockchain for data management: Factom_Whitepaper
Ethereum’s whitepaper on its next generation smart contract and decentralized application platform.
Blockstream’s whitepaper on sidechains.
Ripple Labs’ The Ripple Protocol Consensus Algorithm.
Airline industry whitepaper on economies of distributed ledger.
Open-source contractual language and cryptocontract forms at Common Accord.
Open-source software at Github
Nick Szabo’s home page and blog.
R3 put together a global multi-bank distributed ledger ledger initiative.