In the 2012 thread, I had just launched Improvely.
In the 2013 thread, I had hit $10K/month in recurring revenue.
In the 2014 thread, revenue had doubled to around $20K/mo.
Since then, revenue has doubled again, to around $40K/mo.
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.
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).
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.