Bootstrap 4 Cheat Sheet - An interactive Bootstrap 4 cheat sheet
Volt - Volt is a reactive web framework where Ruby code runs both on the server and the client (via opal).
HackerThemes - Bootstrap 4 themes and tools for web developers
Grid50 - The Marketplace for Photographers & Videographers
Bootstrap Zero - Open-source, free Bootstrap templates collection.
Parachut - Netflix for camera gear