Magi turns a Minecraft build into a 3D scene that opens in any browser. Post a region file, get a link, and let anyone orbit around what you made.
The front page lists the newest builds and the ones picked out by the operator. Every build can also be reached by tag, by the day it was posted, or from its creator's page.
Magipedia is an encyclopedia of every block and item in Minecraft: what each one looks like, how to obtain it, where it generates, and what you can craft from it.