Apache is a free and open-source cross-platform web server software.
cdnjs is a free distributed JS library delivery service.
Font Awesome is a font and icon toolkit based on CSS and Less.
Ionicons is an open-source icon set crafted for web, iOS, Android, and desktop apps.
Material Design Lite is a library of components for web developers.
OpenSSL is a software library for applications that secure communications over computer networks against eavesdropping or need to identify the party at the other end.
Popper is a positioning engine, its purpose is to calculate the position of an element to make it possible to position it near a given reference element.
Unpkg is a content delivery network for everything on npm.