Do you know your neighbors?. Many houses are secured with video cameras and other security related services and technologies. The problem comes when an alarms triggers and nobody knows were the sound came from.
The solution?: Telegram.
Why Telegram?: Because it´s like Whatsapp but with more options and easier to extend.
Create a group with all the folks in the neighborhood. So it´s easier to connect to each other.
An useful chatbot that stores emergency numbers and other information that could become handy.
If you like Python you could use https://github.com/python-telegram-bot/python-telegram-bot
Many alarm systems can send emails or other types of notifications. Connect the Chatbot to these notifications so it can post to the neighborhood group chat. In this way if an alarm is activated people could know where it came from.