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Python Bitcoin tools

Test-Driven Development - Extensive Tutorial. Open Source ebook

Bitcoin Core integration/staging tree

Timelock encryption incentivised by Bitcoin

Prove control over a copay wallet

Mercado Bitcoin API client in Node.js

Bitcoin Cash recovery tool for GreenAddress 2of2 and 2of3

Bitcoin Core project website

Mastering Bitcoin 3rd Edition - Programming the Open Blockchain

Piper: A bitcoin hardware paper wallet printer and so much more. Check out piperwallet.com for more info!

The Ethereum Wiki

try_git tutorial from Code School

Parking Lot calculator examples for ATDD by Example

FitNesse -- The Acceptance Test Wiki