http://duel-portal.com/beta (Master Rule 4 - VRAINS)
Currently included features:
* Generate card directly from YCM
* Built-in Wikia for looking at full-size card images
* Mail feature (to message other members through email)
* Deck rating system
* And more
If you're confused about some aspect of the site, and you already read the FAQ, you can post the question here.