For the past 5 years, almost every day I'm working on https://folge.me - desktop and offline alternative to scribehow, tango and similar apps for creating step by step guides and SOPs
Working on https://folge.me - desktop app for creating step by step tutorials and guides. Unlike modern SaaS businesses I decided to charge one time price, which makes revenue very unpredictable, but usually keeping around 400-500 USD per month