Websites that have a shopping cart or checkout page, either using a known ecommerce platform or a custom solution.
EthicalAds is a privacy-preserving ad network targeting developers.
Font Awesome is a font and icon toolkit based on CSS and Less.
Hugo is an open-source static site generator written in Go.
Open Graph is a protocol that is used to integrate any web page into the social graph.
Plausible is an open-source alternative to Google Analytics.
Typekit is an online service which offers a subscription library of fonts.