Discord bot.

You can learn to interact with APIs and create something useful to your server.

To-do app.

You can play around with it and add more functionalities.

Travel planner.

Create an app that would choose everything you need for a trip e.g. transport, hotel, entertainment etc.

Real Distance API.

You can create an API that returns time of transportation between two points, considering speed limits, road quality.

Time reservation.

It would be great to give someone your calendar so they can reserve your free hours.

See you soon.