Here are some ideas :

-Forms written in Markdown.

-Automatic creation of anti-tracker extensions settings for websites

-A online portal to compare current price of items in cart across various platforms such as flipkart, amazon, etc and provide the best deals available.

-Create a script which would scrape sites like developer.android.com and add the latest versions of the libraries in your android project.

-Facebook Messenger ChatBot, for basic interaction, getting instant news by providing queries, reminders, weather notifications, hazard news notifications, fun games like trivia, and a casino system with games like coin flip, blackjack and dice, where the user can bet a specific amount of money.

-A system that takes important dates like birthdays and anniversaries of our friends and relatives, possibly from Facebook or manually entering them, setting a reminder for us and suggesting gifts we can buy for them based on the relationship and the nearest possible place to get the gift.

A text based adventure game where people collaborate on: 1) Policy decisions 2) logistics planning 3) public health education to prevent the spread of a virus that has mysteriously arrived in a few city centers. Where the interactions are through a chat bot in your favourite texting platform.