Libbitcoin is an open-source and free to use Bitcoin library that is aimed at high-end use. The creators of the project are Amir Taaki and Erik Voskuil. The website is hosted by GitHub pages and has a number of repositories on the GitHub. Libbitcoin is available for Windows, Linux, and OSX. Examples of projects using Libbitcoin include OpenBazaar, DarkLeaks, and airBitz.
The key features of Libbitcoin include the Libbitcoin server and the Libbitcoin explorer. The Libbitcoin server is a full Bitcoin node. The Libbitcoin server applies cryptography which enables users to make stealth payments. It supports both simple and advanced functions and is complemented by the Libbitcoin explorer. The Libbitcoin explorer supports network communication between the Libbitcoin server and the Bitcoin network. It can also be used for both simple and advanced purposes. It also supports stealth and multi-signature. There is documentation covering its use. LibbitCoin also has a mailing list that members can sign up to.