The Greatest Books https://thegreatestbooks.org I created it in 2008 and have maintained and improved it over the years. I am trying to figure out how to monetize it more. I currently make around $2k a month. I just use adsense and have a paid membership feature through buymeacoffee. I get massive traffic and I'm pretty much the #1 result for anything related to best/greatest books. It's built with Rails and Postgresql and hosted on 3 linode servers. I get around 250k page visits a day.