Version 3.0 is now GPL open source! Helios Calendar makes it easy to add a professional looking, feature rich calendar to your website in minutes. Send engaging email newsletters with no monthly fee. Provide a full calendar user experience on mobile devices without any extra apps or work. Extend your publishing power with the Helios Calendar API. Seamlessly integrate HTML5 & CSS3 themes with your custom site designs. Support easy event downloads for popular personal calendars on the desktop (iCalendar) and web (Google, Yahoo & Windows Live). Benefit from integrated access to a variety of APIs from popular sites like: Facebook, Twitter, Eventbrite, Bitly, Google and much, much more. Take the work out of managing your calendar and promote your events more effectively with Helios Calendar.