Ask HN: Now that the Heroku party is over, where do free apps go?

I need to easily deploy landing pages I build with Sinatra somewhere (I know, overkill, static,blah blah). Heroku just sent me my first "you used 16 hours of free tier" thing that says in a few months they'll start just killing your dynos after that.

Is there some kind of buildpack for Linode or AWS to easily deploy multiple apps hosted at different subdomains? Where do we go from here?

Note: I appreciate all Heroku has done for the community and still pay them for stuff, but this is just one part of what I do at work and I need to replace it now.