PillarHub is an open software anyone can use or modify it. The code is published under MIT license which is the same that is used for Pharo itself. You may find sources of PillarHub at SmalltalkHub via this link:
The new PillarHub features are just released: Shared Hub and "thanks" buttons. Check this memo for more information.
You can easily embed an html object inside your Pillar markup using raw-html syntax. For example to embed an YouTube video you can use the following code:
A simple Pillar syntax cheat sheet.
PillarHub is an open platfrom for sharing documents which are written on Pillar markup. The idea is to have a place where you may put pillar-formated documents and have a public link on them. This instance of PillarHub is hosted on Pharocloud and open to be used by anyone so you are welcomed to try it right away!