Nag is a continuous integration monitor. It runs as a client continually monitoring the build status of integration servers such as Continuum and CruiseControl. On operating systems such as Windox and Linux, Nag can be run in the system tray. A standalone client is available for other Operating Systems.

Nag has grown out of an agile development environment where teams want to receive immediate feedback regarding the status of various builds. It provides audible and visual queues as to the status of various build.

Nag is currently in pre-alpha development. The project is sponsored by the Digital Focus Open Source Initiative.