Ah, in Lume beside some official columns, user (dev) can build their column with Lume SDK then publish it (I not make a spec yet). After that, other users can install it to their app.

You totally can convert blowater into a lume's column, then publish and other user will install it.

You can image Lume is a big App Store, beside default experience, user can expand via community

The term "column" may be cause a bit confused, Lume is basically tweetdeck but each column is each experience 

 I need to know more about it. Where can I find out? 

 Sadly, I don't have any documents for lume yet 

 Keep me updated 

 I will write more about it in the weekend and update to you