Bitcoin Untangled

Mission:

Create and maintain a Bitcoin full node and query server.

Slogan:

One node that speaks the protocols your software already uses.

Type:

Developer toolkit

Status:

Stable

Project website/page:

https://libbitcoin.info/

Repository:

https://github.com/libbitcoin/libbitcoin-node

My comment:

Modular C++ toolkit by Eric Voskuil — separate components for system, database, network, node and server. Advanced/developer-oriented, not a one-click GUI client.