Improvely (<a href="https://www.improvely.com" rel="nofollow">https://www.improvely.com</a>) and W3Counter (<a href="https://www.w3counter.com" rel="nofollow">https://www.w3counter.com</a>) both started as tools for my own use, and are now the passive income I live on. They're both analytics tools -- one's geared towards professionals, and the other to hobbyists. Improvely is purely paid subscriptions, while W3Counter is freemium with some ad revenue.<p>In the 2012 thread, I had just launched Improvely.<p>In the 2013 thread, I had hit $10K/month in recurring revenue.<p>In the 2014 thread, revenue had doubled to around $20K/mo.<p>Since then, revenue has doubled again, to around $40K/mo.<p>I still work alone. I took all of August off to visit my girlfriend's extended family in another state and then a beach vacation when we got back. Other than keeping my Surface tablet in my cabin/room in case something were to break that health checks and autoscaling can't fix, and answering a couple customer e-mails before bed each night, everything ran itself just fine.<p>Another side project that's weirdly taken off is "Improved Contact Form". It's a little one-click-install app for Shopify stores that I threw together for a relative. It adds one of those floating "Contact Us" buttons to each page, that pops up a contact form, along with a dedicated contact page. When someone submits either form, the store owner gets the mail along with a list of all the pages the customer viewed before contacting them and the customer's location (geoip lookup).<p>I threw it up on their app directory for free, and a year later, I host the contact forms on 10% of their stores, which is ~17K companies or so. I'm going to need to leverage that into something eventually. Maybe a whole suite of one-click-install widgets for shops, like a SumoMe for ecommerce.