Color Palette: https://flatuicolors.com/palette/de
Logo: Font Awesome "Magnet" symbol (https://gauger.io/fonticon/), Favicons generated with https://realfavicongenerator.net/
CSS Framework: PureCSS (v2) https://github.com/pure-css/pure
Icons: Heroicons
Programming Languages: Go, Javascript
Database: CockroachDB
Templates: Go stdlib html/template, see templates directory. Templates with _ prefix are partials, all others are root pages.
Email SMTP Service: Postale.io