mongoose-slug-plugin
Slugs for Mongoose with history and i18n support (uses speakingurl by default, but you can use any slug library such as limax, slugify, mollusc, or slugme)
mongoose-fill
Mongoose.js add-on that adds virtual (temporary) async fileds API
moonridge
Isomorphic library, which allows you to use Mongoose.js models via socket.io-rpc doing regular queries and liveQueries