Try before you buy
Read sample articles from recent issues of PragPub:
Programming Elixir: A Gentle Introduction by Dave Thomas
3D Graphics with SceneKit: Scaling Complexity by David Rönnqvist
Want to see more? Four years of back issues, through July 2013, can be downloaded here.
But what have you done for us lately?
The contents of the latest issue and other recent issues can be found here