There're tons of garbage collection mom-and-pop companies serving small and rural neighborhoods. Believe it or not, they need software to run their business, and the current one sucks. Most of software designed for garbage collectors is just a simple ugly-looking billing software, but how about (1) Something very user-friendly that looks like it was made in 21st century? (2) The ability for customers to see a portal where they can manage their account and pay the bill and, MOST IMPORTANTLY (3) The ability for the software to optimize routes for garbage trucks, so they can eat less gas and collect garbage faster, thus reducing labor costs. Right now #3 is based purely on human decisions, which is probably wrong. I'll bet you #3 would sell well, especially if it was integrated with the other parts.