The application lies within System Tools, more precisely General. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe.
From the developer:
iCalDoit is a collection of Automator Actions, Automator Workflows, and AppleScripts handlers, to bring more ease of use to iCal workflows.
included actions:get iCal selection get events of a calendar get events from... to...