Easy to use, but be sure to get version 3 if you are running Nagios 3

This add-on neatly adds the ability to set up recurring down-time for hosts or services with a web front-end which integrates well with the standard Nagios gui.

Version 3 of this add-on is now available for users of Nagios 3. Check out Steve’s support forum at http://www.steveshipway.org/forum/ (under “Nagios: Interoperability, Plugins and Utilities”) for the latest on this.