Download of iCalMail 1.5 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. This free software for Mac OS X is an intellectual property of Shullian Productions. The application belongs to Communication Tools. 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:
iCalMail... This program creates a calendar that lets you automatically email people at certain times. The following shows what becomes what in an e-mail: event name -> subject location -> attachment attendees -> recipients notes field -> message text url field -> sender email It is not necessary to click the "Send" button. Doing so will execute iCal's normal invitation system.
You may want to check out more Mac applications, such as Installer OS X El Capitan, which might be similar to iCalMail.