For Heartlytica, I did some research on how bounce rate affects SEO in a previous article. I built this product to determine how long a person is viewing a particular page, and what they are viewing.
I enjoy building products that people use. I noticed a lot of people putting filters on their profile pics, but not goto tool for adding them, so I built one.
A product for rapid styling of websites. Seriously, find a template on w3schools or upload your own website. Then use this product to add css frameworks, fonts and themes based on the colors from other websites, and you are done!