Google Calendar Alternatives?

I just need a simple calendar app that will send me reminders on my phone which I can view offline without an account. I don't care about sharing it with anyone and I plan on syncing the data for it using some Cloud Storage I have. I want to be able to set up a few weekly tasks (recurring) and then be able to add a small handfull of things specific to certain dates/times. What are apps for windows/linux/android that can do this? I can't seem to find good free answers online.