Currently TuskTools Calendar is only available as a Windows application.
It's possible in the future there may be versions developed for other platforms, but nothing is in the works or will be available in the near term. I will be closely monitoring user requests as time goes forward.
One important note, however: if you're using Google Calendar and have enabled Google Calendar synching in your Windows TuskTools Calendar application, then your dated Evernote notes (i.e. the ones you enter in TuskTools Calendar, or that you enter in Evernote in the TuskTools Calendar ##date## format) will be available in your Google Calendar on all of your devices!