Local instance loads remote Web resources

I can't call this a bug report, because it's obviously intentional, but the CodeWorld home page of a locally installed instance loads many remote resources, including--

+ Google APIs (with Google authentication disabled)
+ JQuery from jquery.com
+ Something from jsdelivr.net
+ Something from wurfl.io
+ Something from polyfill.io
+ (Presumably) icons from materialdesignicons.com

... and stuff from various CDNs probably associated with the above.

I would not expect a local instance to load any code from, or communicate in any way with, anything but its own server, and definitely not without explicit permission from an administrator.