Ringer lets you control the device ringer according to your calendar events and/or g-sensor. It also allow you to set the device into "meeting profile" where the phone beeps once for incoming call. Ringer comes with several widgets: a simple toggle widget to manually change the ringer mode, a toggle-clock widget which present the calendar events for the next 12 hours, and timer widgets which allow you to set to silent/meeting profile for a predetermined amount of time. Ringer also allows many customizations such as setting the ringtone for the beep, calendars and events to watch and much more.
For additional information and updates visit ringer's website on http://forum.xda-developers.com/showthread.php?t=1870142