Agency owner who loves building software in his free time

Hey Product Hunters, I'm a software agency owner for 4 years, and in my normal work life, I don't develop software anymore; I just have these CEO tasks, and I like them. BUT Building software has been my passion since I was 13 years old, starting with some Minecraft plugins for my own server. That was a great time. Currently, I'm building a nice, simple marketing funnel tool. I think I will release it in 1-1.5 months. I would really like to hear your stories, why you build products, and what you are building currently?