Webki, a London-based group about which I can find very little– their Web site doesn't say who works there, their Flickr account has pictures from one event in 2012, and they share offices with something called Semantica Research— recently published a pretty good list of free mindfulness apps.
It included a few I'd never heard of, but which sound interesting enough to download and try.
They also recently had, or maybe just announced, an event on digital mindfulness. It's kind of hard to tell.