Few years ago, I made a simple web app using a non-profit's API (I was bored) with no expectations. I haven't touched it in like 3 years, I still have at least

Few years ago, I made a simple web app using a non-profit's API (I was bored) with no expectations. I haven't touched it in like 3 years, I still have at least a few dozen people using it daily and once in a while, I get a nice thank you message. If you hang out in forums frequented by enthusiastic supporters of non profits, you can find tons of ideas.