Does QGIS have any plugin to work with the WhatThreeWords mapping project? If not now, are there any plugins in process?
Using a simple w3w wrapper here:
I wrote a custom python function to return the what3words given a location. Once hooked into the expression engine, you can do something like generate labels with what3words:
This is done with the following expression in the layer label dialog:
In all this took me about twenty minutes.
But the real question is what do you want to do with what3words?
Boundless have recently written a plugin that integrates What3Words in to QGIS. The plugin allows you to zoom to a What3Words address and also to click on the map and display the What3Words address of the point you clicked. Note it doesn't display the What3Words 3mx3m grid. Full details can be found here:
At the moment the plugin needs to be installed manually. This is really easy, you just download the files from GitHub then copy the 'what3words' folder to your plugins directory on your local PC (something like C:\Users\.qgis2\pyton\plugins\ on Windows), then enable the plugin through the plugin manager in QGIS.
The only other thing you need is a What3Words API key, which you can get by registering with them on this page: http://developer.what3words.com/