Bitwarden infrastructure/backend (API, database, Docker, etc).

Bitcoin Core integration/staging tree

Bitwarden client apps (web, browser extension, desktop, and cli).

Bitcoin Improvement Proposals

Bitwarden mobile apps (Password Manager and Authenticator) for Android.

A complete course for learning Bitcoin programming and usage from the command

Phoenix is a self-custodial Bitcoin wallet using Lightning to send/receive payments.

ZXing ("Zebra Crossing") barcode scanning library for Java, Android

Explore the full Bitcoin ecosystem with mempool.space, or be your own explorer and self-host your own instance with one-click installation on popular Raspberry Pi fullnode distros including Umbrel,…

Blockstream Green Wallet for Android

Go ahead and axolotl questions

Chaumian ecash wallet and mint for Bitcoin

Lightning Address - like an email address, but for your Bitcoin

Satpile.app

An E2E test automation framework blueprint that shows good practices.

Mastering Bitcoin 3rd Edition - Programming the Open Blockchain

Support bitcoin developers so they can focus on building our future.

Bitcoin resources (meetups, books, wallets, podcasts, conferences and much more)

Bitcoin Improvement Proposals

⚡️ A minimalistic wallet GUI for c-lightning, accessible over the web or through mobile and desktop apps.

A bitcoin blockchain explorer and API

logos, statutes, etc. from bitcoinassociation.ch

A browser extension for redeeming Cashu tokens on the web

Some examples of Test-Driven Development for Infrastructure

The desktop vault (Windows, macOS, & Linux).

The command line vault (Windows, macOS, & Linux).

Easiest Bitcoin Lightning desktop app, for Windows, macOS, and Linux

Documentation of Security Tokens and their uses.