Architecture of Open Source Applications, Vol. 1

The Architecture of Open Source Applications . Volume 1 . aosabook.org . Accessed Jan 19, 2026. Asterisk . A server application for making, receiving, and performing custom processing of phone calls. Audacity . A popular sound recorder and audio editor. One goal is that its user interface should be discoverable: people should be able to sit down without a manual and start using it right away.