The Mist browser is the tool of choice to browse and use Ðapps.
To run mist in development you need Node.js NPM and Meteor installed
Then install electron and initialize the git submodules:
$ npm install -g electron-prebuilt
$ git submodule update --init
Start the mist UI interface first using Meteor:
$ cd mist/interface
$ npm install
$ meteor
And then in another terminal window start mist with:
$ cd mist
$ electron ./