c-lightning

c-lightning is a standard compliant implementation of the Lightning Network protocol.

Read all the available documentation at https://lightning.readthedocs.io/.

Esplora

Esplora is a block explorer web interface based on the esplora-electrs HTTP API. It’s written as a single-page app in a reactive and functional style using rxjs and cycle.js.

See live at blockstream.info.

The API documentation is available here.

Libwally

Wally is a cross-platform, cross-language collection of useful primitives for cryptocurrency wallets.

Read the API documentation at https://wally.readthedocs.io.

GDK

GDK is a cross-platform, cross-language library for Blockstream Green wallets.

You can read the API documentation at https://gdk.readthedocs.io/en/latest/.

Elements

Elements is an open source, sidechain-capable blockchain platform.

Built upon and extending Bitcoin’s codebase, it lets developers quickly and cost-effectively create working blockchains and test proof-of-concept projects. It also enables Elements to function as a testbed for changes to the Bitcoin protocol itself. Blockstream’s own production sidechain, Liquid, is built using Elements.

The Elements community website contains:

A walk-through tutorial.

Basic and advanced code samples.

Application development guides.