Wazo is an application suite based on several free existing components including Asterisk, and our own developments to provide communication services (IPBX, Unified Messaging, ...) to businesses.
Wazo is a free software. Most of its distinctive components, and Wazo as a whole, are distributed under the GPLv3 license.
You may also check the Wazo blog for more information.
Wazo documentation is also available as a downloadable HTML, EPUB or PDF file. See the downloads page for a list of available files or use the menu on the lower right.