MortNotifier

This app allows you to schedule notifications whenever you like.
While I'm aware some of it can be done with e.g. the calendar, this tool allows a bit more without cluttering your calendar schedule.
Please note it's a quite new app, so while everything worked fine in my tests, bugs might happen.

Supported schedule types are:
- Fixed time: just remind you at a single time
- Timer: send a notification after some minutes
- Week days: select the days of the week you like to be notified, handy for alarms
- Day of year: same procedure as every year?
- Day of month: same day every month

Supported notification types are:
- System: The well known notification in the notification bar, optionally with sound and/or vibration
- Pebble: Send you notification directly to the Pebble without having to clean up any system notifications (requires official Pebble app with enabled 3rd party notifications)
- Openwatch: Have a watch supported by the Openwatch app? Great, similar like Pebble for you then.