If you want to help with mapping data, click Download ZIP to download the repository (about 45mb), there are a lot of CSV files. You can open these and begin to match columns. It is a bit tedious and I hope to make a tool that will make the whole process simplier!

Data Mining Tools

FFXIV Explorer

Built by: https://www.reddit.com/user/Ioncannon
Download: http://ffxivexplorer.fragmenterworks.com/

This is one of the best applications to just get stuck in with and get going somewhere. It is very well polished, has an excellent 3D model viewer.

Saint Coinach

Managed by: Clorifex
GitHub: https://github.com/ufx/SaintCoinach

APIs

The XIVDB website has an API here: http://v2.xivdb.com/api