An alarm clock with support for daily repeating alarms and notifications.
An add-on that supplies events to the Calendar app.
A hunting and fishing add-on app.
A 24-hour clock & roman timekeeping add-on app.
To create an application that is:
1) high quality: solves a problem with well defined scope (and solves it well). 2) libre software: grants essential software freedoms. 3) respectful of privacy: no ads, no network access, no non-essential permissions, no bullshit. 4) accessible: usable by a wide range of people with individual capability. 5) localized: support for multiple languages, rules, and formats. 6) compatible: runs on the widest range of devices possible (support for older devices).