I gave away and eventually sold snippets of front end web tools (example code mostly) shortly after picking up basic JavaScript/HTML/CSS skills as a pre-teen in

I gave away and eventually sold snippets of front end web tools (example code mostly) shortly after picking up basic JavaScript/HTML/CSS skills as a pre-teen in the late 90's. My first product was a "login" script (just JavaScript which generated an encoded version of a username and password and navigated to that URL). I remember when I received my first envelope with a $10 check and an email address inside. That was an awesome feeling. I also made a fairly complicated "calendar creator" script which allowed a user to stylize and customize a calendar template that would be output in the form of HTML, CSS, and JavaScript. Since HTML, CSS, and JavaScript were the only tools I knew how to use that's naturally what I wrote the program using. Everything was output in a textarea field for "easy" copy-pasting into the user's website. After a few years I realized the programs were becoming dated (I started receiving more frequent refund requests) and I stopped charging and open sourced them. In hindsight, the programs were fairly poorly written but I'm glad to know that at least a couple dozen people found them useful.