Bootstrap Magic - Create your Bootstrap 4.0 themes easily with magic
Pastelink.net - Anonymously publish text with hyperlinks enabled.
Bootstrap 4 Cheat Sheet - An interactive Bootstrap 4 cheat sheet
Pastebin.com - Pastebin.com is a website where you can store text for a certain period of time.
HackerThemes - Bootstrap 4 themes and tools for web developers
Pastery - The sweetest pastebin in the world.