I like data science and telegram bots. Check out some examples at my github or twitter.
Started during covid with bots looking for available vaccination appointments:
Leipzig: https://t.me/coronaimpftermine_leipzig
Dresden: https://t.me/coronaimpftermine_dresden
Stuttgart: https://t.me/coronaimpftermine_stuttgart
Hamburg: https://t.me/coronaimpftermine_hamburg